[Sema] Don't crash if array bound calculation overflowed constexpr array

We didn't correctly expect a QualifiedTypeLoc when faced with fixing a
variable array type into a constant array type.

Differential Revision: http://reviews.llvm.org/D8958

llvm-svn: 235251
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 1bad38f..f6cb282 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -4891,6 +4891,8 @@
 
 static void
 FixInvalidVariablyModifiedTypeLoc(TypeLoc SrcTL, TypeLoc DstTL) {
+  SrcTL = SrcTL.getUnqualifiedLoc();
+  DstTL = DstTL.getUnqualifiedLoc();
   if (PointerTypeLoc SrcPTL = SrcTL.getAs<PointerTypeLoc>()) {
     PointerTypeLoc DstPTL = DstTL.castAs<PointerTypeLoc>();
     FixInvalidVariablyModifiedTypeLoc(SrcPTL.getPointeeLoc(),