Exclude several ASan tests from test suite if we're using GCC

llvm-svn: 209013
diff --git a/compiler-rt/test/asan/TestCases/heap-overflow.cc b/compiler-rt/test/asan/TestCases/heap-overflow.cc
index 1a5098a..d5797dc9 100644
--- a/compiler-rt/test/asan/TestCases/heap-overflow.cc
+++ b/compiler-rt/test/asan/TestCases/heap-overflow.cc
@@ -3,6 +3,10 @@
 // RUN: %clangxx_asan -O2 %s -o %t && not %run %t 2>&1 | FileCheck %s
 // RUN: %clangxx_asan -O3 %s -o %t && not %run %t 2>&1 | FileCheck %s
 // RUN: ASAN_OPTIONS=print_stats=1 not %run %t 2>&1 | FileCheck %s
+
+// FIXME: Fix this test under GCC.
+// REQUIRES: Clang
+
 #include <stdlib.h>
 #include <string.h>
 int main(int argc, char **argv) {