move getNameWithPrefix and getSymbol to TargetMachine.

TargetLoweringBase is implemented in CodeGen, so before this patch we had
a dependency fom Target to CodeGen. This would show up as a link failure of
llvm-stress when building with -DBUILD_SHARED_LIBS=ON.

This fixes pr18900.

llvm-svn: 201711
diff --git a/llvm/lib/Target/X86/X86TargetObjectFile.cpp b/llvm/lib/Target/X86/X86TargetObjectFile.cpp
index 95fccba..0a88e98 100644
--- a/llvm/lib/Target/X86/X86TargetObjectFile.cpp
+++ b/llvm/lib/Target/X86/X86TargetObjectFile.cpp
@@ -27,7 +27,7 @@
   // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
   // is an indirect pc-relative reference.
   if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) {
-    const MCSymbol *Sym = TM.getTargetLowering()->getSymbol(GV, Mang);
+    const MCSymbol *Sym = TM.getSymbol(GV, Mang);
     const MCExpr *Res =
       MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext());
     const MCExpr *Four = MCConstantExpr::Create(4, getContext());
@@ -41,7 +41,7 @@
 MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol(
     const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM,
     MachineModuleInfo *MMI) const {
-  return TM.getTargetLowering()->getSymbol(GV, Mang);
+  return TM.getSymbol(GV, Mang);
 }
 
 void
@@ -102,7 +102,7 @@
   if (GVLHS->isThreadLocal())
     return 0;
 
-  return MCSymbolRefExpr::Create(TM.getTargetLowering()->getSymbol(GVLHS, Mang),
+  return MCSymbolRefExpr::Create(TM.getSymbol(GVLHS, Mang),
                                  MCSymbolRefExpr::VK_COFF_IMGREL32,
                                  getContext());
 }