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

[David Majnemer]

Hi rsmith,

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

http://reviews.llvm.org/D8958

Files:
  lib/Sema/SemaDecl.cpp
  test/CXX/basic/basic.types/p10.cpp

Index: lib/Sema/SemaDecl.cpp
===================================================================
--- lib/Sema/SemaDecl.cpp
+++ 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(),
Index: test/CXX/basic/basic.types/p10.cpp
===================================================================
--- test/CXX/basic/basic.types/p10.cpp
+++ test/CXX/basic/basic.types/p10.cpp
@@ -139,3 +139,5 @@
 constexpr int arb(int n) {
   int a[n]; // expected-error {{variable of non-literal type 'int [n]' cannot be defined in a constexpr function}}
 }
+constexpr long Overflow[ // expected-error {{constexpr variable cannot have non-literal type 'long const[(1 << 30) << 2]'}}
+    (1 << 30) << 2]{};   // expected-warning {{requires 34 bits to represent}}

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