Add support of SANITIZE_TARGET='address coverage' for fuzzing.

Also, add trace-cmp instrumentation to fuzz_test and host_fuzz_test.

Bug: 22850550
Change-Id: Ifff7b8be693ae991feb0a64e19439370a19b2748
diff --git a/core/fuzz_test.mk b/core/fuzz_test.mk
index 065cc03..fc582b3 100644
--- a/core/fuzz_test.mk
+++ b/core/fuzz_test.mk
@@ -7,7 +7,7 @@
     $(error $(LOCAL_PATH): $(LOCAL_MODULE): NDK fuzz tests are not supported.)
 endif
 
-LOCAL_CFLAGS += -fsanitize-coverage=edge,indirect-calls,8bit-counters
+LOCAL_CFLAGS += -fsanitize-coverage=edge,indirect-calls,8bit-counters,trace-cmp
 LOCAL_STATIC_LIBRARIES += libLLVMFuzzer
 
 ifdef LOCAL_MODULE_PATH