Sema: Don't crash converting to bool from _Atomic

Turning our _Atomic L-value into an R-value removes its _Atomic-ness.
However, we didn't update our 'FromType' which made
ScalarTypeToBooleanCastKind think we were trying to pass it a
non-scalar.

This fixes PR21836.

llvm-svn: 224322

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaExprCXX.cpp b/clang/lib/Sema/SemaExprCXX.cpp
index 1f9c1ea73cd..2227721f70e 100644
--- a/clang/lib/Sema/SemaExprCXX.cpp
+++ b/clang/lib/Sema/SemaExprCXX.cpp
@@ -2754,10 +2754,10 @@ Sema::PerformImplicitConversion(Expr *From, QualType ToType,
 
   case ICK_Lvalue_To_Rvalue: {
     assert(From->getObjectKind() != OK_ObjCProperty);
-    FromType = FromType.getUnqualifiedType();
     ExprResult FromRes = DefaultLvalueConversion(From);
     assert(!FromRes.isInvalid() && "Can't perform deduced conversion?!");
     From = FromRes.get();
+    FromType = From->getType();
     break;
   }