diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -41,7 +41,8 @@
   // Don't forward inputs from the original command line.  They are added from
   // InputInfoList.
   return O.getKind() != Option::InputClass &&
-         !O.hasFlag(options::DriverOption) && !O.hasFlag(options::LinkerInput);
+         !O.hasFlag(options::DriverOption) && !O.hasFlag(options::LinkerInput) &&
+         !O.matches(options::OPT_mllvm);
 }
 
 // Switch CPU names not recognized by GNU assembler to a close CPU that it does
diff --git a/clang/test/Driver/gcc_forward.c b/clang/test/Driver/gcc_forward.c
--- a/clang/test/Driver/gcc_forward.c
+++ b/clang/test/Driver/gcc_forward.c
@@ -1,4 +1,4 @@
-// Check that we don't try to forward -Xclang or -mlinker-version to GCC.
+// Check that we don't try to forward -Xclang, -mlinker-version or -mllvm to GCC.
 // PR12920 -- Check also we may not forward W_Group options to GCC.
 //
 // RUN: %clang -target powerpc-unknown-unknown \
@@ -6,6 +6,7 @@
 // RUN:   -Wall -Wdocumentation \
 // RUN:   -Xclang foo-bar \
 // RUN:   -march=x86-64 \
+// RUN:   -mllvm -x86-experimental-lvi-inline-asm-hardening \
 // RUN:   -mlinker-version=10 -### 2> %t
 // RUN: FileCheck < %t %s
 //
@@ -19,12 +20,16 @@
 // CHECK-NOT: "-mlinker-version=10"
 // CHECK-NOT: "-Xclang"
 // CHECK-NOT: "foo-bar"
+// CHECK-NOT: "-mllvm"
+// CHECK-NOT: "-x86-experimental-lvi-inline-asm-hardening"
 // CHECK-NOT: "-Wall"
 // CHECK-NOT: "-Wdocumentation"
 // CHECK: -march
 // CHECK-NOT: "-mlinker-version=10"
 // CHECK-NOT: "-Xclang"
 // CHECK-NOT: "foo-bar"
+// CHECK-NOT: "-mllvm"
+// CHECK-NOT: "-x86-experimental-lvi-inline-asm-hardening"
 // CHECK-NOT: "-Wall"
 // CHECK-NOT: "-Wdocumentation"
 // CHECK: "-o" "a.out"