Do not sign extend floating-point values in the asm parser.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124831 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index 61ceee4..8654db5 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -568,7 +568,7 @@
   }
   case AsmToken::Real: {
     APFloat RealVal(APFloat::IEEEdouble, getTok().getString());
-    int64_t IntVal = RealVal.bitcastToAPInt().getSExtValue();
+    uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue();
     Res = MCConstantExpr::Create(IntVal, getContext());
     Lex(); // Eat token.
     return false;