JIT: Added SVE_GD_2A ARM64 encoding

[TIHan]

Contributes to #94549

This adds the SVE_GD_2A encoding.

Capstone:

A0402845  sqxtnb        z0.b, z5.h
E3442845  sqxtnt        z3.b, z7.h
00512845  sqxtunb       z0.b, z8.h
65542845  sqxtunt       z5.b, z3.h
E0482845  uqxtnb        z0.b, z7.h
204C2845  uqxtnt        z0.b, z1.h
00403045  sqxtnb        z0.h, z0.s
29453045  sqxtnt        z9.h, z9.s
C0503045  sqxtunb       z0.h, z6.s
80543045  sqxtunt       z0.h, z4.s
46483045  uqxtnb        z6.h, z2.s
204C3045  uqxtnt        z0.h, z1.s
E7406045  sqxtnb        z7.s, z7.d
00456045  sqxtnt        z0.s, z8.d
20516045  sqxtunb       z0.s, z9.d
80546045  sqxtunt       z0.s, z4.d
23496045  uqxtnb        z3.s, z9.d
604C6045  uqxtnt        z0.s, z3.d

JitDisasm:

IN00a2: 00028C                    sqxtnb  z0.b, z5.h
IN00a3: 000290                    sqxtnt  z3.b, z7.h
IN00a4: 000294                    sqxtunb z0.b, z8.h
IN00a5: 000298                    sqxtunt z5.b, z3.h
IN00a6: 00029C                    uqxtnb  z0.b, z7.h
IN00a7: 0002A0                    uqxtnt  z0.b, z1.h
IN00a8: 0002A4                    sqxtnb  z0.h, z0.s
IN00a9: 0002A8                    sqxtnt  z9.h, z9.s
IN00aa: 0002AC                    sqxtunb z0.h, z6.s
IN00ab: 0002B0                    sqxtunt z0.h, z4.s
IN00ac: 0002B4                    uqxtnb  z6.h, z2.s
IN00ad: 0002B8                    uqxtnt  z0.h, z1.s
IN00ae: 0002BC                    sqxtnb  z7.s, z7.d
IN00af: 0002C0                    sqxtnt  z0.s, z8.d
IN00b0: 0002C4                    sqxtunb z0.s, z9.d
IN00b1: 0002C8                    sqxtunt z0.s, z4.d
IN00b2: 0002CC                    uqxtnb  z3.s, z9.d
IN00b3: 0002D0                    uqxtnt  z0.s, z3.d

Edit: Pasting the screenshot of diff for easy comparison:

[ghost]

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Issue Details

---

Contributes to #94549

This adds the SVE_GD_2A encoding.

Left: capstone, Right: JitDisasm

Author:	TIHan
Assignees:	TIHan
Labels:	area-CodeGen-coreclr
Milestone:	-

[TIHan]

@dotnet/jit-contrib @kunalspathak this is ready

[kunalspathak]

LGTM