fix variable names; NFCI

Because we're just 'or-ing' these 2 variables later in the code, I
don't think there's a logical bug here, but of course the string with
"no size" is the one that should have the size suffix stripped off.

llvm-svn: 284826
diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
index 84d2256..4101697 100644
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -1973,7 +1973,7 @@
   // The attribute string may omit the size suffix ('f'/'d').
   std::string VTName = getReciprocalOpName(IsSqrt, VT);
   std::string VTNameNoSize = VTName;
-  VTName.pop_back();
+  VTNameNoSize.pop_back();
   static const char DisabledPrefix = '!';
 
   for (StringRef RecipType : OverrideVector) {
@@ -2028,7 +2028,7 @@
   // The attribute string may omit the size suffix ('f'/'d').
   std::string VTName = getReciprocalOpName(IsSqrt, VT);
   std::string VTNameNoSize = VTName;
-  VTName.pop_back();
+  VTNameNoSize.pop_back();
 
   for (StringRef RecipType : OverrideVector) {
     size_t RefPos;