[TargetLibraryInfo] memcpy and memset have optimized codegen.

[courbet]

Summary

Add memcpy and memset to the list of function with optimized codegen.
hasOptimizedCodeGen() was returning false for them.
This was not an issue when working with c++ as clang typically emits an
intrinsic rather than a libfunc call, but when working with IR,
this would cause some issues with sanitizers which would not correctly
mark the function as nobuiltin in maybeMarkSanitizerLibraryCallNoBuiltin().

[xbolva00]

llvm/include/llvm/Analysis/TargetLibraryInfo.h

353

Memmove?

[courbet]

Add memmove

llvm/include/llvm/Analysis/TargetLibraryInfo.h

 //===-- TargetLibraryInfo.h - Library information ---------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_ANALYSIS_TARGETLIBRARYINFO_H
bool hasOptimizedCodeGen(LibFunc F) const {
     case LibFunc_floor:        case LibFunc_floorf:     case LibFunc_floorl:
     case LibFunc_nearbyint:    case LibFunc_nearbyintf: case LibFunc_nearbyintl:
     case LibFunc_ceil:         case LibFunc_ceilf:      case LibFunc_ceill:
     case LibFunc_rint:         case LibFunc_rintf:      case LibFunc_rintl:
     case LibFunc_round:        case LibFunc_roundf:     case LibFunc_roundl:
     case LibFunc_trunc:        case LibFunc_truncf:     case LibFunc_truncl:
     case LibFunc_log2:         case LibFunc_log2f:      case LibFunc_log2l:
     case LibFunc_exp2:         case LibFunc_exp2f:      case LibFunc_exp2l:
+    case LibFunc_memcpy:       case LibFunc_memset:     case LibFunc_memmove:
     case LibFunc_memcmp:       case LibFunc_bcmp:       case LibFunc_strcmp:
     case LibFunc_strcpy:       case LibFunc_stpcpy:     case LibFunc_strlen:
     case LibFunc_strnlen:      case LibFunc_memchr:     case LibFunc_mempcpy:
       return true;
     }
     return false;
   }