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/switch.c b/test/Sema/switch.c
index 5886fef..25e1d4d 100644
--- a/test/Sema/switch.c
+++ b/test/Sema/switch.c
@@ -39,8 +39,8 @@
   }
 
   switch(1)  {
-  case g(): // expected-error {{case label does not reduce to an integer constant}}
-  case 0 ... g(): // expected-error {{case label does not reduce to an integer constant}}
+  case g(): // expected-error {{expression is not an integer constant expression}}
+  case 0 ... g(): // expected-error {{expression is not an integer constant expression}}
     break;
   }
   
@@ -50,12 +50,12 @@
   }
   
   switch (1) {
-  case g() && 0: // expected-error {{case label does not reduce to an integer constant}}
+  case g() && 0: // expected-error {{expression is not an integer constant expression}} // expected-note {{subexpression not valid in an integer constant expression}}
     break;
   }
   
   switch (1) {
-  case 0 ... g() || 1: // expected-error {{case label does not reduce to an integer constant}}
+  case 0 ... g() || 1: // expected-error {{expression is not an integer constant expression}} // expected-note {{subexpression not valid in an integer constant expression}}
     break;
   }
 }