improve performance using Unsafe to activate/deactivate thread filter

[zhengyu123]

What does this PR do?:
JavaProfiler activate/deactivate a thread for profiling via JNI call, which is expensive.

This enhancement intends to expose native bitmap, that is used for tracking thread’s state, to java and uses Unsafe API to update the bitmap directly.

Motivation:
Improve performance

Additional Notes:

Used Erwan's thread filter benchmark:

Baseline:

After patch:

How to test the change?:

• gradlew testdebug/testrelease
• ddprof-stresstest + Erwan's thread filter benchmark

For Datadog employees:

• If this PR touches code that signs or publishes builds or packages, or handles
  credentials of any kind, I've requested a review from @DataDog/security-design-and-guidance.
• This PR doesn't touch any of that.
• JIRA: PROF-12008

Unsure? Have a question? Request a review!

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CppCheck Report

Errors (2)

• There is an unknown macro here somewhere. Configuration is required. If LP64_ONLY is a macro then please configure it.
• syntax error

Warnings (4)

• The class 'RecordingBuffer' defines member function with name 'flushIfNeeded' also defined in its parent class 'Buffer'.
• Member variable 'JitWriteProtection::_restore' is not initialized in the constructor.
• Member variable 'JitWriteProtection::_restore' is not initialized in the constructor.
• Member variable 'ElfParser::_vaddr_diff' is not initialized in the constructor.

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