[MachineOutliner] Replace ostringstream based string concatenation with Twine

This makes my libLLVMCodeGen.so.9svn 4936 bytes smaller.

While here, delete unused #include <map>

llvm-svn: 358089

1 files changed, 4 insertions, 10 deletions

diff --git a/llvm/lib/CodeGen/MachineOutliner.cpp b/llvm/lib/CodeGen/MachineOutliner.cpp
index 8c06260..7b1750a 100644
--- a/llvm/lib/CodeGen/MachineOutliner.cpp
+++ b/llvm/lib/CodeGen/MachineOutliner.cpp
@@ -73,8 +73,6 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 #include <functional>
-#include <map>
-#include <sstream>
 #include <tuple>
 #include <vector>
 
@@ -1094,19 +1092,15 @@ MachineOutliner::createOutlinedFunction(Module &M, OutlinedFunction &OF,
                                         InstructionMapper &Mapper,
                                         unsigned Name) {
 
-  // Create the function name. This should be unique. For now, just hash the
-  // module name and include it in the function name plus the number of this
-  // function.
-  std::ostringstream NameStream;
+  // Create the function name. This should be unique.
   // FIXME: We should have a better naming scheme. This should be stable,
   // regardless of changes to the outliner's cost model/traversal order.
-  NameStream << "OUTLINED_FUNCTION_" << Name;
+  std::string FunctionName = ("OUTLINED_FUNCTION_" + Twine(Name)).str();
 
   // Create the function using an IR-level function.
   LLVMContext &C = M.getContext();
-  Function *F =
-      Function::Create(FunctionType::get(Type::getVoidTy(C), false),
-                       Function::ExternalLinkage, NameStream.str(), M);
+  Function *F = Function::Create(FunctionType::get(Type::getVoidTy(C), false),
+                                 Function::ExternalLinkage, FunctionName, M);
 
   // NOTE: If this is linkonceodr, then we can take advantage of linker deduping
   // which gives us better results when we outline from linkonceodr functions.