Move architecture-specific code out of codegencommon.cpp (#65488)

Move architecture-specific code out of codegencommon.cpp (#65488)

Move about 3300 lines of architecture-specific code to the
architecture-specific codegen files (codegenarm.cpp, codegenarm64.cpp,
codegenarmarch.cpp, codegenxarch.cpp). Much of this is prolog/epilog
generation.

A new set of arch-specific functions, genZeroInitFrameUsingBlockInit,
is added to extract a huge amount of arch-specific code from genZeroInitFrame.

The moved code wasn't altered except to remove unnecessary ifdefs.

Minor:
- inlined and removed getAdjustSP
- removed unused Compiler versions of GetHasTailCalls/SetHasTailCalls