PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() and
zextOrTrunc(), and APSInt methods extend(), extOrTrunc() and new method
trunc(), to be const and to return a new value instead of modifying the
object in place.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121120 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index a1f70fb..68f7946 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -2575,7 +2575,7 @@
   case ValID::t_APSInt:
     if (!Ty->isIntegerTy())
       return Error(ID.Loc, "integer constant must have integer type");
-    ID.APSIntVal.extOrTrunc(Ty->getPrimitiveSizeInBits());
+    ID.APSIntVal = ID.APSIntVal.extOrTrunc(Ty->getPrimitiveSizeInBits());
     V = ConstantInt::get(Context, ID.APSIntVal);
     return false;
   case ValID::t_APFloat: