Display profile file name when emitting a file not found diagnostic.

When a profile file cannot be opened, we used to display just the error
message but not the name of the profile the compiler was trying to open.
This will become useful in the next set of patches that introduce
GCC-compatible flags to specify profiles.

llvm-svn: 240715

clang/lib/CodeGen/CodeGenModule.cpp

@@ -145,8 +145,9 @@ CodeGenModule::CodeGenModule(ASTContext &C, const CodeGenOptions &CGO,
         llvm::IndexedInstrProfReader::create(CodeGenOpts.InstrProfileInput);
     if (std::error_code EC = ReaderOrErr.getError()) {
       unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
-                                              "Could not read profile: %0");
-      getDiags().Report(DiagID) << EC.message();
+                                              "Could not read profile %0: %1");
+      getDiags().Report(DiagID) << CodeGenOpts.InstrProfileInput
+                                << EC.message();
     } else
       PGOReader = std::move(ReaderOrErr.get());
   }