Revert "JIT: Allow use of cbz/cbnz for conditional branch gen."

This reverts commit 96022b2f17b1113dd6d3cd8449f6fc307ecc7f98.
Revert "JIT: Combine shift & sub for monitor unlock."

This reverts commit 514ebcfa03adcfa3913dc77f288dd4eb228cced2.
Revert "JIT: Use vmla.f64 instead of vmuld + vaddd."

This reverts commit 359022a578d4a422ec1c772df1a74a4f464ed18c.