[libfuzzer] fixing collected pc addresses for coverage

Summary: The causes google/ossfuzz#84

Reviewers: kcc

Subscribers: mgorny

Differential Revision: https://reviews.llvm.org/D28827

llvm-svn: 292289
diff --git a/llvm/lib/Fuzzer/FuzzerDefs.h b/llvm/lib/Fuzzer/FuzzerDefs.h
index 0f5b8a7..ef990e1 100644
--- a/llvm/lib/Fuzzer/FuzzerDefs.h
+++ b/llvm/lib/Fuzzer/FuzzerDefs.h
@@ -47,9 +47,11 @@
 
 #ifdef __clang__  // avoid gcc warning.
 #  define ATTRIBUTE_NO_SANITIZE_MEMORY __attribute__((no_sanitize("memory")))
+#  define ALWAYS_INLINE __attribute__((always_inline))
 #else
 #  define ATTRIBUTE_NO_SANITIZE_MEMORY
-#endif
+#  define ALWAYS_INLINE
+#endif // __clang__
 
 namespace fuzzer {