[Arm64] Address inconsistencies between JitDisasm and WinDbg u command output

[echesakov]

As pointed out in #36552 (comment) and #36552 (comment) there are some inconsistencies/wrong disassemblies for some of the Long, Wide and Narrow Arm64 instructions.

For example, JIT outputs sqrshrn b0,b1,#1 when it should be sqrshrn b0,h1,#1

category:implementation
theme:debug-dumps
skill-level:beginner
cost:medium
impact:small

[echesakov]

cc @BruceForstall

[echesakov]

Most of the discrepancies between the JIT output and WinDbg u command (mostly related to the new SIMD instructions added in .NET 5.0 timeline) were addressed by #38361.

The remaining differences in the output were captured in https://github.com/dotnet/runtime/files/4828121/compare-windbgu-jitdump.txt and will not be fixed in 5.0. Moving the issue to the future.