8286331: jni_GetStringUTFChars() uses wrong heap allocator

Backport-of: b0d2b0a3553cbb2db23d543b98ab1401b3dbfa91

Author: shipilev

src/hotspot/share/prims/jni.cpp

@@ -2234,7 +2234,7 @@ JNI_ENTRY(const char*, jni_GetStringUTFChars(JNIEnv *env, jstring string, jboole
   if (s_value != NULL) {
     size_t length = java_lang_String::utf8_length(java_string, s_value);
     /* JNI Specification states return NULL on OOM */
-    result = AllocateHeap(length + 1, mtInternal, 0, AllocFailStrategy::RETURN_NULL);
+    result = AllocateHeap(length + 1, mtInternal, AllocFailStrategy::RETURN_NULL);
     if (result != NULL) {
       java_lang_String::as_utf8_string(java_string, s_value, result, (int) length + 1);
       if (isCopy != NULL) {

src/hotspot/share/utilities/nativeCallStack.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -64,7 +64,7 @@ class NativeCallStack : public StackObj {
     memset(_stack, 0, sizeof(_stack));
   }
 
-  NativeCallStack(int toSkip);
+  explicit NativeCallStack(int toSkip);
   NativeCallStack(address* pc, int frameCount);
 
   static inline const NativeCallStack& empty_stack() { return _empty_stack; }