Don't indicate FIPS mode when built with ASAN.

ASAN prevents the integrity test from running, so don't indicate FIPS
mode in that case.

Change-Id: I14c79e733e53ef16f164132bc1fded871ce3f133
Reviewed-on: https://boringssl-review.googlesource.com/16024
Commit-Queue: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

crypto/fipsmodule/is_fips.c

@@ -18,8 +18,14 @@
 /* This file exists in order to give the fipsmodule target, in non-FIPS mode,
  * something to compile. */
 
+#if defined(__has_feature)
+#if __has_feature(address_sanitizer)
+#define OPENSSL_ASAN
+#endif
+#endif
+
 int FIPS_mode(void) {
-#if defined(BORINGSSL_FIPS)
+#if defined(BORINGSSL_FIPS) && !defined(OPENSSL_ASAN)
   return 1;
 #else
   return 0;