Remove MaxFunctionCount module flag annotation

[eraman]

Summary

Step 2 of MaxFunctionCount removal. It is superseded by ProfileSummary flag.

[vsk]

Lgtm

[eraman]

This patch and the one in D19185 are now ready to land as the inliner now uses ProfileSummaryInfo. I will check them in.

lib/CodeGen/CodeGenModule.cpp

if (Context.getLangOpts().CUDA && !Context.getLangOpts().CUDAIsDevice &&
     if (llvm::Function *CudaDtorFunction = CUDARuntime->makeModuleDtorFunction())
       AddGlobalDtor(CudaDtorFunction);
   }
   if (OpenMPRuntime)
     if (llvm::Function *OpenMPRegistrationFunction =
             OpenMPRuntime->emitRegistrationFunction())
       AddGlobalCtor(OpenMPRegistrationFunction, 0);
   if (PGOReader) {
-    getModule().setMaximumFunctionCount(PGOReader->getMaximumFunctionCount());
     getModule().setProfileSummary(PGOReader->getSummary().getMD(VMContext));
     if (PGOStats.hasDiagnostics())
       PGOStats.reportDiagnostics(getDiags(), getCodeGenOpts().MainFileName);
   }
   EmitCtorList(GlobalCtors, "llvm.global_ctors");
   EmitCtorList(GlobalDtors, "llvm.global_dtors");
   EmitGlobalAnnotations();
   EmitStaticExternCAliases();

test/Profile/max-function-count.c

-// Test that maximum function counts are set correctly.
-
-// RUN: llvm-profdata merge %S/Inputs/max-function-count.proftext -o %t.profdata
-// RUN: %clang %s -o - -mllvm -disable-llvm-optzns -emit-llvm -S -fprofile-instr-use=%t.profdata | FileCheck %s
-//
-int begin(int i) {
-  if (i)
-    return 0;
-  return 1;
-}
-
-int end(int i) {
-  if (i)
-    return 0;
-  return 1;
-}
-
-int main(int argc, const char *argv[]) {
-  begin(0);
-  end(1);
-  end(1);
-  return 0;
-}
-// CHECK: !{{[0-9]+}} = !{i32 1, !"MaxFunctionCount", i32 2}