[Bitcode] Update naming of UNOP_NEG to UNOP_FNEG

Differential Revision: https://reviews.llvm.org/D68588

llvm-svn: 373958

lib/Bitcode/Reader/BitcodeReader.cpp

@@ -1063,7 +1063,7 @@ static int getDecodedUnaryOpcode(unsigned Val, Type *Ty) {
   switch (Val) {
   default:
     return -1;
-  case bitc::UNOP_NEG:
+  case bitc::UNOP_FNEG:
     return IsFP ? Instruction::FNeg : -1;
   }
 }