Initial update to VMCore to use Twines for string arguments.

- The only meat here is in Value.{h,cpp} the rest is essential 'const
   std::string &' -> 'const Twine &'.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77048 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/GlobalVariable.h

@@ -52,13 +52,13 @@ public:
   /// automatically inserted into the end of the specified modules global list.
   GlobalVariable(LLVMContext &Context, const Type *Ty, bool isConstant,
                  LinkageTypes Linkage,
-                 Constant *Initializer = 0, const std::string &Name = "",
+                 Constant *Initializer = 0, const Twine &Name = "",
                  bool ThreadLocal = false, unsigned AddressSpace = 0);
   /// GlobalVariable ctor - This creates a global and inserts it before the
   /// specified other global.
   GlobalVariable(Module &M, const Type *Ty, bool isConstant,
                  LinkageTypes Linkage, Constant *Initializer,
-                 const std::string &Name,
+                 const Twine &Name,
                  GlobalVariable *InsertBefore = 0, bool ThreadLocal = false,
                  unsigned AddressSpace = 0);