[clang][CodeGen] ImplicitIntegerSignChangeSanitizer: actually ignore NOP casts.

I fully expected for that to be handled by the canonical type check,
but it clearly wasn't. Sadly, somehow it hide until now.

Reported by Eli Friedman.

llvm-svn: 345816

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/test/CodeGen/catch-implicit-integer-sign-changes-true-negatives.c b/clang/test/CodeGen/catch-implicit-integer-sign-changes-true-negatives.c
index 3798cccdd53..b847344818c 100644
--- a/clang/test/CodeGen/catch-implicit-integer-sign-changes-true-negatives.c
+++ b/clang/test/CodeGen/catch-implicit-integer-sign-changes-true-negatives.c
@@ -138,3 +138,15 @@ uint32_t unsigned_int_to_uint32(unsigned int src) {
 uint32_t uint32_to_uint32(uint32_t src) {
   return src;
 }
+
+// "Transparent" Enum.
+// ========================================================================== //
+
+enum a { b = ~2147483647 };
+enum a c();
+void d(int);
+void e();
+void e() {
+  enum a f = c();
+  d(f);
+}