[AArch64] Implement extshx and extsbx.
[AArch64] Implement cntlzwx.
[AArch64] Implement negx.
[AArch64] Implement mcrf.
[AArch64] Implement mtsr and mfsr
[AArch64] Implement mtsprin and mfsprin
[AArch64] Implement mfmsr
[AArch64] Implement twi and tw.
Fix some warnings on Linux
Android: Silence some more warnings.
JIT: fix merged bclr with comex's BLR optimizations
Merge pull request #1152 from FioraAeterna/fixmergedbclr

JIT: fix merged bclr with comex's BLR optimizations
Merge pull request #1142 from lioncash/linucks

Fix some warnings on Linux
Merge pull request #1130 from Sonicadvance1/AArch64-jit-extXx

[AArch64] Implement instructions.
Merge pull request #1149 from rohit-n/android-warnings

Android: Silence some more warnings.