8046662: Check JNI ReleaseStringChars / ReleaseStringUTFChars verify_guards test inverted Summary: negative verify_guards when testing for corruption Reviewed-by: sla, fparain

8043224: -Xcheck:jni improvements to exception checking and excessive local refs Summary: Warning when not checking exceptions from function that require so, also when local refs expand beyond capacity. Reviewed-by: zgu, coleenp, hseigel