Index: llvm/trunk/lib/Transforms/IPO/Inliner.cpp
===================================================================
--- llvm/trunk/lib/Transforms/IPO/Inliner.cpp
+++ llvm/trunk/lib/Transforms/IPO/Inliner.cpp
@@ -830,8 +830,14 @@
   // incrementally maknig a single function grow in a super linear fashion.
   SmallVector<std::pair<CallSite, int>, 16> Calls;
 
+  FunctionAnalysisManager &FAM =
+      AM.getResult<FunctionAnalysisManagerCGSCCProxy>(InitialC, CG)
+          .getManager();
+
   // Populate the initial list of calls in this SCC.
   for (auto &N : InitialC) {
+    auto &ORE =
+        FAM.getResult<OptimizationRemarkEmitterAnalysis>(N.getFunction());
     // We want to generally process call sites top-down in order for
     // simplifications stemming from replacing the call with the returned value
     // after inlining to be visible to subsequent inlining decisions.
@@ -839,9 +845,20 @@
     // Instead we should do an actual RPO walk of the function body.
     for (Instruction &I : instructions(N.getFunction()))
       if (auto CS = CallSite(&I))
-        if (Function *Callee = CS.getCalledFunction())
+        if (Function *Callee = CS.getCalledFunction()) {
           if (!Callee->isDeclaration())
             Calls.push_back({CS, -1});
+          else if (!isa<IntrinsicInst>(I)) {
+            using namespace ore;
+            ORE.emit([&]() {
+              return OptimizationRemarkMissed(DEBUG_TYPE, "NoDefinition", &I)
+                     << NV("Callee", Callee) << " will not be inlined into "
+                     << NV("Caller", CS.getCaller())
+                     << " because its definition is unavailable"
+                     << setIsVerbose();
+            });
+          }
+        }
   }
   if (Calls.empty())
     return PreservedAnalyses::all();
Index: llvm/trunk/test/Other/new-pm-defaults.ll
===================================================================
--- llvm/trunk/test/Other/new-pm-defaults.ll
+++ llvm/trunk/test/Other/new-pm-defaults.ll
@@ -113,8 +113,8 @@
 ; CHECK-O-NEXT: Starting CGSCC pass manager run.
 ; CHECK-O-NEXT: Running pass: InlinerPass
 ; CHECK-O-NEXT: Running analysis: OuterAnalysisManagerProxy<{{.*}}LazyCallGraph{{.*}}>
-; CHECK-O-NEXT: Running pass: PostOrderFunctionAttrsPass
 ; CHECK-O-NEXT: Running analysis: FunctionAnalysisManagerCGSCCProxy
+; CHECK-O-NEXT: Running pass: PostOrderFunctionAttrsPass
 ; CHECK-O3-NEXT: Running pass: ArgumentPromotionPass
 ; CHECK-O-NEXT: Running pass: CGSCCToFunctionPassAdaptor<{{.*}}PassManager{{.*}}>
 ; CHECK-O-NEXT: Starting llvm::Function pass manager run.
Index: llvm/trunk/test/Other/new-pm-thinlto-defaults.ll
===================================================================
--- llvm/trunk/test/Other/new-pm-thinlto-defaults.ll
+++ llvm/trunk/test/Other/new-pm-thinlto-defaults.ll
@@ -98,8 +98,8 @@
 ; CHECK-O-NEXT: Starting CGSCC pass manager run.
 ; CHECK-O-NEXT: Running pass: InlinerPass
 ; CHECK-O-NEXT: Running analysis: OuterAnalysisManagerProxy<{{.*}}LazyCallGraph{{.*}}>
-; CHECK-O-NEXT: Running pass: PostOrderFunctionAttrsPass
 ; CHECK-O-NEXT: Running analysis: FunctionAnalysisManagerCGSCCProxy
+; CHECK-O-NEXT: Running pass: PostOrderFunctionAttrsPass
 ; CHECK-O3-NEXT: Running pass: ArgumentPromotionPass
 ; CHECK-O-NEXT: Running pass: CGSCCToFunctionPassAdaptor<{{.*}}PassManager{{.*}}>
 ; CHECK-O-NEXT: Starting llvm::Function pass manager run.
Index: llvm/trunk/test/Transforms/Inline/optimization-remarks-yaml.ll
===================================================================
--- llvm/trunk/test/Transforms/Inline/optimization-remarks-yaml.ll
+++ llvm/trunk/test/Transforms/Inline/optimization-remarks-yaml.ll
@@ -20,10 +20,10 @@
 ; NewPM:
 ; RUN: opt < %s -S -passes=inline -pass-remarks-missed=inline \
 ; RUN:     -pass-remarks-with-hotness -pass-remarks-hotness-threshold 15 \
-; RUN:     -pass-remarks-output=%t 2>&1 | FileCheck %s -check-prefix=CHECK_NEW
-; RUN: test ! -s %t
+; RUN:     -pass-remarks-output=%t 2>&1 | FileCheck %s
+; RUN: cat %t | FileCheck -check-prefix=YAML %s
 ; RUN: opt < %s -S -passes=inline -pass-remarks-with-hotness -pass-remarks-output=%t
-; RUN: test ! -s %t
+; RUN: cat %t | FileCheck -check-prefix=YAML %s
 ;
 ; Verify that remarks that don't meet the hotness threshold are not output.
 ; RUN: opt < %s -S -passes=inline -pass-remarks-missed=inline \
@@ -79,9 +79,6 @@
 ; No remarks should be output, since none meet the threshold.
 ; THRESHOLD-NOT: remark
 
-; NewPM does not output this kind of "missed" remark.
-; CHECK_NEW-NOT: remark
-
 ; ModuleID = '/tmp/s.c'
 source_filename = "/tmp/s.c"
 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
Index: llvm/trunk/test/Transforms/Inline/optimization-remarks.ll
===================================================================
--- llvm/trunk/test/Transforms/Inline/optimization-remarks.ll
+++ llvm/trunk/test/Transforms/Inline/optimization-remarks.ll
@@ -10,12 +10,10 @@
 ; RUN:       FileCheck -check-prefix=CHECK -check-prefix=NO_HOTNESS %s
 ; RUN: opt < %s -passes=inline -pass-remarks=inline -pass-remarks-missed=inline \
 ; RUN:       -pass-remarks-analysis=inline -pass-remarks-with-hotness -S 2>&1 | \
-; RUN:       FileCheck -check-prefix=CHECK -check-prefix=HOTNESS_NEW %s
+; RUN:       FileCheck -check-prefix=CHECK -check-prefix=HOTNESS %s
 
 ; HOTNESS: fox will not be inlined into bar because its definition is unavailable
 ; NO_HOTNESS-NOT: fox will not be inlined into bar because its definition is unavailable
-; NewPM's inliner does not emit the following remark:
-; HOTNESS_NEW-NOT: fox will not be inlined into bar because its definition is unavailable
 ; CHECK: foo inlined into bar with cost=always
 ; CHECK: foz not inlined into bar because it should never be inlined (cost=never)