[ARM64] Change INS_bkpt to INS_brk for INS_BREAKPOINT (#892)
* [ARM64] Change INS_bkpt to INS_brk for INS_BREAKPOINT
https://github.com/dotnet/runtime/issues/606
* [ARM64] Change INS_bkpt to INS_brk for INS_BREAKPOINT
https://github.com/dotnet/runtime/issues/606
* [ARM64] Change INS_bkpt to INS_brk for INS_BREAKPOINT
https://github.com/dotnet/runtime/issues/606
* [ARM64] Change INS_bkpt to INS_brk for TARGET_UNIX
https://github.com/dotnet/runtime/issues/606
* [ARM64] Change INS_bkpt to INS_brk for TARGET_UNIX
https://github.com/dotnet/runtime/issues/606
* Fix formatting errors for INS_MULADD