diff --git a/llvm/test/Other/ChangePrinters/print-changed-diff.ll b/llvm/test/Other/ChangePrinters/print-changed-diff.ll
--- a/llvm/test/Other/ChangePrinters/print-changed-diff.ll
+++ b/llvm/test/Other/ChangePrinters/print-changed-diff.ll
@@ -140,7 +140,6 @@
 
 ; CHECK-DIFF-SIMPLE: *** IR Dump At Start ***
 ; CHECK-DIFF-SIMPLE: ModuleID = {{.+}}
-; CHECK-DIFF-SIMPLE: *** IR Dump After VerifierPass on [module] omitted because no change ***
 ; CHECK-DIFF-SIMPLE: *** IR Dump After InstSimplifyPass on g ***
 ; CHECK-DIFF-SIMPLE-NOT: ModuleID = {{.+}}
 ; CHECK-DIFF-SIMPLE-NOT: *** IR{{.*}}
@@ -353,7 +352,6 @@
 
 ; CHECK-CDIFF-SIMPLE: *** IR Dump At Start ***
 ; CHECK-CDIFF-SIMPLE: ModuleID = {{.+}}
-; CHECK-CDIFF-SIMPLE: *** IR Dump After VerifierPass on [module] omitted because no change ***
 ; CHECK-CDIFF-SIMPLE: *** IR Dump After InstSimplifyPass on g ***
 ; CHECK-CDIFF-SIMPLE-NOT: ModuleID = {{.+}}
 ; CHECK-CDIFF-SIMPLE-NOT: *** IR{{.*}}
diff --git a/llvm/test/Other/change-printer.ll b/llvm/test/Other/change-printer.ll
--- a/llvm/test/Other/change-printer.ll
+++ b/llvm/test/Other/change-printer.ll
@@ -109,7 +109,6 @@
 
 ; CHECK-SIMPLE: *** IR Dump At Start ***
 ; CHECK-SIMPLE-NEXT: ; ModuleID = {{.+}}
-; CHECK-SIMPLE: *** IR Dump After VerifierPass on [module] omitted because no change ***
 ; CHECK-SIMPLE: *** IR Dump After InstSimplifyPass on g ***
 ; CHECK-SIMPLE-NEXT: define i32 @g()
 ; CHECK-SIMPLE: *** IR Pass PassManager{{.*}} on g ignored ***
@@ -189,7 +188,6 @@
 
 ; CHECK-SIMPLE-BEFORE: *** IR Dump At Start ***
 ; CHECK-SIMPLE-BEFORE-NEXT: ; ModuleID = {{.+}}
-; CHECK-SIMPLE-BEFORE: *** IR Dump After VerifierPass on [module] omitted because no change ***
 ; CHECK-SIMPLE-BEFORE: *** IR Dump Before InstSimplifyPass on g ***
 ; CHECK-SIMPLE-BEFORE-NEXT: define i32 @g()
 ; CHECK-SIMPLE-BEFORE: *** IR Dump After InstSimplifyPass on g ***
diff --git a/llvm/test/Other/new-pass-manager-verify-each.ll b/llvm/test/Other/new-pass-manager-verify-each.ll
--- a/llvm/test/Other/new-pass-manager-verify-each.ll
+++ b/llvm/test/Other/new-pass-manager-verify-each.ll
@@ -1,7 +1,7 @@
 ; RUN: opt -disable-output -debug-pass-manager -verify-each -passes='no-op-module,verify,cgscc(no-op-cgscc,function(no-op-function,loop(no-op-loop)))' %s 2>&1 | FileCheck %s
 
-; Added manually by opt at beginning
-; CHECK: Running pass: VerifierPass
+; opt already manually verifies input IR
+; CHECK-NOT: Running pass: VerifierPass
 
 ; CHECK: Running pass: NoOpModulePass
 ; CHECK: Verifying module
diff --git a/llvm/test/Other/new-pass-manager.ll b/llvm/test/Other/new-pass-manager.ll
--- a/llvm/test/Other/new-pass-manager.ll
+++ b/llvm/test/Other/new-pass-manager.ll
@@ -39,7 +39,6 @@
 
 ; RUN: opt -disable-output -debug-pass-manager -passes=print %s 2>&1 \
 ; RUN:     | FileCheck %s --check-prefix=CHECK-MODULE-PRINT
-; CHECK-MODULE-PRINT: Running pass: VerifierPass
 ; CHECK-MODULE-PRINT: Running pass: PrintModulePass
 ; CHECK-MODULE-PRINT: ModuleID
 ; CHECK-MODULE-PRINT: define void @foo(i1 %x, i8* %p1, i8* %p2)
@@ -54,7 +53,6 @@
 
 ; RUN: opt -disable-output -debug-pass-manager -passes='function(print)' %s 2>&1 \
 ; RUN:     | FileCheck %s --check-prefix=CHECK-FUNCTION-PRINT
-; CHECK-FUNCTION-PRINT: Running pass: VerifierPass
 ; CHECK-FUNCTION-PRINT: Running analysis: InnerAnalysisManagerProxy<{{.*}}>
 ; CHECK-FUNCTION-PRINT: Running pass: PrintFunctionPass
 ; CHECK-FUNCTION-PRINT-NOT: ModuleID
@@ -93,7 +91,6 @@
 ; CHECK-NO-VERIFY-NOT: VerifierPass
 ; CHECK-NO-VERIFY: Running pass: NoOpFunctionPass
 ; CHECK-NO-VERIFY-NOT: VerifierPass
-; CHECK-NO-VERIFY-NOT: VerifierPass
 
 ; RUN: opt -disable-output -debug-pass-manager \
 ; RUN:     -passes='require<no-op-module>,cgscc(require<no-op-cgscc>,function(require<no-op-function>))' %s 2>&1 \
diff --git a/llvm/test/Other/opt-bisect-new-pass-manager.ll b/llvm/test/Other/opt-bisect-new-pass-manager.ll
--- a/llvm/test/Other/opt-bisect-new-pass-manager.ll
+++ b/llvm/test/Other/opt-bisect-new-pass-manager.ll
@@ -21,19 +21,15 @@
 ; RUN: opt -disable-output -debug-pass-manager \
 ; RUN:     -passes=inferattrs -opt-bisect-limit=-1 %s 2>&1 \
 ; RUN:     | FileCheck %s --check-prefix=CHECK-REQUIRED-PASS
-; CHECK-REQUIRED-PASS-NOT: BISECT: {{.*}} VerifierPass
-; CHECK-REQUIRED-PASS: Running pass: VerifierPass
 ; CHECK-REQUIRED-PASS: BISECT: running pass (1) InferFunctionAttrsPass on [module]
-; CHECK-REQUIRED-PASS-NOT: BISECT: {{.*}} VerifierPass
+; CHECK-REQUIRED-PASS-NOT: BISECT: {{.*}}VerifierPass
 ; CHECK-REQUIRED-PASS: Running pass: VerifierPass
 
 ; RUN: opt -disable-output -debug-pass-manager \
 ; RUN:     -passes=inferattrs -opt-bisect-limit=0 %s 2>&1 \
 ; RUN:     | FileCheck %s --check-prefix=CHECK-LIMIT-REQUIRED-PASS
-; CHECK-LIMIT-REQUIRED-PASS-NOT: BISECT: {{.*}} VerifierPass
-; CHECK-LIMIT-REQUIRED-PASS: Running pass: VerifierPass
 ; CHECK-LIMIT-REQUIRED-PASS: BISECT: NOT running pass (1) InferFunctionAttrsPass on [module]
-; CHECK-LIMIT-REQUIRED-PASS-NOT: BISECT: {{.*}} VerifierPass
+; CHECK-LIMIT-REQUIRED-PASS-NOT: BISECT: {{.*}}VerifierPass
 ; CHECK-LIMIT-REQUIRED-PASS: Running pass: VerifierPass
 
 ; RUN: opt -disable-output -disable-verify \
diff --git a/llvm/test/Other/printer.ll b/llvm/test/Other/printer.ll
--- a/llvm/test/Other/printer.ll
+++ b/llvm/test/Other/printer.ll
@@ -8,7 +8,6 @@
   ret void
 }
 
-; CHECK:      *** IR Dump After VerifierPass
 ; CHECK:      *** IR Dump After PromotePass
 ; CHECK-NEXT: define void @tester
 ; CHECK:      *** IR Dump After InstCombinePass
diff --git a/llvm/tools/opt/NewPMDriver.h b/llvm/tools/opt/NewPMDriver.h
--- a/llvm/tools/opt/NewPMDriver.h
+++ b/llvm/tools/opt/NewPMDriver.h
@@ -43,11 +43,7 @@
   OK_OutputBitcode,
   OK_OutputThinLTOBitcode,
 };
-enum VerifierKind {
-  VK_NoVerifier,
-  VK_VerifyInAndOut,
-  VK_VerifyEachPass
-};
+enum VerifierKind { VK_NoVerifier, VK_VerifyOut, VK_VerifyEachPass };
 enum PGOKind {
   NoPGO,
   InstrGen,
diff --git a/llvm/tools/opt/NewPMDriver.cpp b/llvm/tools/opt/NewPMDriver.cpp
--- a/llvm/tools/opt/NewPMDriver.cpp
+++ b/llvm/tools/opt/NewPMDriver.cpp
@@ -438,8 +438,6 @@
   PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
 
   ModulePassManager MPM;
-  if (VK > VK_NoVerifier)
-    MPM.addPass(VerifierPass());
   if (EnableDebugify)
     MPM.addPass(NewPMDebugifyPass());
   if (VerifyDIPreserve)
diff --git a/llvm/tools/opt/opt.cpp b/llvm/tools/opt/opt.cpp
--- a/llvm/tools/opt/opt.cpp
+++ b/llvm/tools/opt/opt.cpp
@@ -695,7 +695,7 @@
                ? OK_OutputAssembly
                : (OutputThinLTOBC ? OK_OutputThinLTOBitcode : OK_OutputBitcode);
 
-    VerifierKind VK = VK_VerifyInAndOut;
+    VerifierKind VK = VK_VerifyOut;
     if (NoVerify)
       VK = VK_NoVerifier;
     else if (VerifyEach)