[AArch64] Enable CmpBcc fusion for Neoverse-v2 (#90608)

This adds compare and branch instructions fusion for Neoverse V2.
According to the Software Optimization Guide:
Specific Aarch64 instruction pairs that can be fused are as follows: 
CMP/CMN (immediate) + B.cond
CMP/CMN (register) + B.cond

Performance for SPEC2017 is neutral, but another benchmark improves
significantly.
Results for SPEC2017 on a Neoverse V2:
500.perlbench 0%
502.gcc_r 0%
505.mcf_r -0.15%
523.xalancbmk_r -0.43%
525.x264_r 0%
531.deepsjeng_r 0%
541.leela_r -0.16%
557.xz_r -0.47%