add a setName variant that takes a null-terminated string.  This can be
used to avoid std::string allocations in common cases.

llvm-svn: 34232
diff --git a/llvm/lib/VMCore/Value.cpp b/llvm/lib/VMCore/Value.cpp
index ee6f94a..c7af931 100644
--- a/llvm/lib/VMCore/Value.cpp
+++ b/llvm/lib/VMCore/Value.cpp
@@ -122,6 +122,10 @@
   setName(&name[0], name.size());
 }
 
+void Value::setName(const char *Name) {
+  setName(Name, Name ? strlen(Name) : 0);
+}
+
 void Value::setName(const char *NameStr, unsigned NameLen) {
   if (NameLen == 0 && !hasName()) return;
   if (getType() != Type::VoidTy && "Cannot assign a name to void values!");