Flush JIT data cache when committing code.

Otherwise, executing compiled code may see old data from
the data cache.

Test: ART_TEST_JIT=true test-art-target on arm/arm64
Test: run-libcore-tests.sh (especially jsr166) on arm/arm64
Change-Id: Id037c68897aa0e9ccacd4c5121f3743fb722c6f3
diff --git a/runtime/utils.h b/runtime/utils.h
index 04e0dde..16ef706 100644
--- a/runtime/utils.h
+++ b/runtime/utils.h
@@ -284,6 +284,12 @@
   __builtin___clear_cache(begin, end);
 }
 
+inline void FlushDataCache(char* begin, char* end) {
+  // Same as FlushInstructionCache for lack of other builtin. __builtin___clear_cache
+  // flushes both caches.
+  __builtin___clear_cache(begin, end);
+}
+
 template <typename T>
 constexpr PointerSize ConvertToPointerSize(T any) {
   if (any == 4 || any == 8) {