RFR: 8341788: Fix ExceptionOccurred in hotspot

[Justin Lu]

A trivial JNI refactoring in Hotspot to use `ExceptionCheck()` over `ExceptionOccurred()` when the usage is treating the return value as a boolean. This is part of the bigger umbrella issue: [JDK-8341542](https://bugs.openjdk.org/browse/JDK-8341542). 



>     ExceptionCheck
>     We introduce a convenience function to check for pending exceptions without creating a local reference to the exception object.
> 
>     jboolean ExceptionCheck(JNIEnv *env);
> 
>     Returns JNI_TRUE when there is a pending exception; otherwise, returns JNI_FALSE.

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Commit messages:
 - init

Changes: https://git.openjdk.org/jdk/pull/21724/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21724&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341788
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/21724.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21724/head:pull/21724

PR: https://git.openjdk.org/jdk/pull/21724