reimplement getPICLabelString as PrintPICBaseSymbol to eliminate std::string heap thrashing.

llvm-svn: 74105
diff --git a/llvm/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.h b/llvm/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.h
index 24cd601..8bcf43c 100644
--- a/llvm/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.h
+++ b/llvm/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.h
@@ -187,6 +187,8 @@
   void printPICLabel(const MachineInstr *MI, unsigned Op);
   void printModuleLevelGV(const GlobalVariable* GVar);
 
+  void PrintPICBaseSymbol() const;
+  
   bool runOnMachineFunction(MachineFunction &F);
 
   void emitFunctionHeader(const MachineFunction &MF);