JBR-3323 Exclude parts of VM code from sanitizer checks

Exclude VM error-reporting code that treats memory as a raw sequence of
bytes from address sanitizer checks. This is needed to only get true
reports when running tests against the --enable-asan build.

src/hotspot/share/runtime/os.cpp

@@ -990,6 +990,7 @@ static void print_hex_location(outputStream* st, address p, int unitsize) {
   }
 }
 
+ATTRIBUTE_NO_SANITIZE_ADDRESS("Memory is read raw here without any regard for objects' boundaries")
 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize,
                         int bytes_per_line, address logical_start) {
   assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking");

src/hotspot/share/utilities/compilerWarnings.hpp

@@ -103,4 +103,10 @@
 #define ALLOW_C_FUNCTION(name, ...) __VA_ARGS__
 #endif
 
+#if defined(__clang__) || defined (__GNUC__)
+# define ATTRIBUTE_NO_SANITIZE_ADDRESS(reason_for_exclusion) __attribute__((no_sanitize_address))
+#else
+# define ATTRIBUTE_NO_SANITIZE_ADDRESS(reason_for_exclusion)
+#endif
+
 #endif // SHARE_UTILITIES_COMPILERWARNINGS_HPP

src/hotspot/share/utilities/vmError.cpp

@@ -660,6 +660,7 @@ void VMError::clear_step_start_time() {
 // could be nested report_and_die() calls on stack (see above). Only one
 // thread can report error, so large buffers are statically allocated in data
 // segment.
+ATTRIBUTE_NO_SANITIZE_ADDRESS("Memory is read raw here without any regard for objects' boundaries")
 void VMError::report(outputStream* st, bool _verbose) {
   // Used by reattempt step logic
   static int continuation = 0;