x86-64: Inline small array copy size for int and long arrays

[a7ehuo]

Resubmit https://github.com/eclipse/omr/pull/7362 which was reverted in https://github.com/eclipse/omr/pull/7365, plus update the code to have the threshold as 32 bytes to use rep mov. The code that supports the threshold as 64/128 bytes is kept for now for future improvement.

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(1) Inline small array copy size without using rep movs for int array and long array if copy size <= 32 bytes

(2) Add the following options to disable the enhancement

• disableArrayCopyIntArrayInlineSmallSizeWithoutREPMOVS: disable the enhancement for int array

• disableArrayCopyLongArrayInlineSmallSizeWithoutREPMOVS: disable the enhancement for long array

• disableArrayCopyReferenceArrayInlineSmallSizeWithoutREPMOVS: disable the enhancement for reference array, which will be implemented in downstream project OpenJ9.

[a7ehuo]

@0xdaryl May I ask you to review this change? Thank you!

@vijaysun-omr @ymanton @hzongaro fyi

[0xdaryl]

Jenkins build xlinux,x32linux,win,osx