Sema: handle typo correction on ARC'ed ivar

The ivar ref would be transformed by the Typo Correction TreeTransform, but not
be owned, resulting in the source location being invalid.  This would eventually
lead to an assertion in findCapturingExpr.  Prevent this assertion from
triggering.

Resolves PR25113.

llvm-svn: 260017

clang/lib/Sema/SemaExprCXX.cpp

@@ -6590,6 +6590,10 @@ public:
     return Owned(E);
   }
 
+  ExprResult TransformObjCIvarRefExpr(ObjCIvarRefExpr *E) {
+    return Owned(E);
+  }
+
   ExprResult Transform(Expr *E) {
     ExprResult Res;
     while (true) {

clang/test/SemaObjC/typo-correction-arc.m

@@ -2,16 +2,21 @@
 
 typedef unsigned long NSUInteger;
 
+id nameless;                                  // expected-note{{'nameless' declared here}}
+
 @interface NSArray
 - (instancetype)initWithObjects:(const id[])objects count:(NSUInteger)count;
 @end
 
 @interface I
 @property NSArray *array;
+- (id)getArrayById:(id)name;
+- (void)setArrayValue:(id)array;
 @end
 
 @interface J
 - (void)setArray:(id)array;
+- (void)setIvarArray;
 @end
 
 @implementation J {
@@ -20,5 +25,8 @@ typedef unsigned long NSUInteger;
 - (void)setArray:(id)array {  // expected-note{{'array' declared here}}
   i.array = aray;             // expected-error{{use of undeclared identifier 'aray'; did you mean 'array'}}
 }
+- (void)setIvarArray {
+  [i setArrayValue:[i getArrayById:nameles]]; // expected-error{{use of undeclared identifier 'nameles'; did you mean 'nameless'}}
+}
 @end