8369211: AArch64: Devirtualize class RelocActions

[theRealAph]

RelocActions is instantiated every time we need to apply a reloc. There's really no need for this, and the use of virtual member functions and function pointers obfuscates the code.

While C++ compilers can devirtualize much of this, they don't always devirtualize all of it. Let's make RelocActions all static.

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• JDK-8369211: AArch64: Devirtualize class RelocActions (Enhancement - P4)

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