Use VerifyIntegerConstantExpression for case values.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@60317 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/complex-int.c b/test/Sema/complex-int.c
index 1e58b53..77bfc9c 100644
--- a/test/Sema/complex-int.c
+++ b/test/Sema/complex-int.c
@@ -16,8 +16,8 @@
 result = xx*yy;
 
 switch (arr) { // expected-error{{statement requires expression of integer type ('_Complex int' invalid)}}
-  case brr: ; // expected-error{{case label does not reduce to an integer constant}}
-  case xx: ; // expected-error{{case label does not reduce to an integer constant}}
+  case brr: ; // expected-error{{expression is not an integer constant expression}}
+  case xx: ; // expected-error{{expression is not an integer constant expression}}
 }
 }