JIT: Enable AddrMode for GC types on arm64

[EgorBo]

Follow up to #61293 (#65468 did it for floating points recently) to handle gc types too, e.g.:

objectTest(object[]array,inti)=>array[i];

; Method Tests4:Test(System.Object[],int):System.Object:this
G_M52569_IG01:
stp fp, lr, [sp,#-16]!
mov fp, sp
G_M52569_IG02:
ldr w0, [x1,#8]
cmp w2, w0
bhs G_M52569_IG04
- ubfiz x0, x2, #3, #32- add x0, x0, #16- ldr x0, [x1, x0]+ add x0, x1, #16+ ldr x0, [x0, w2, UXTW #3]
G_M52569_IG03:
ldp fp, lr, [sp],#16
ret lr
G_M52569_IG04:
bl CORINFO_HELP_RNGCHKFAIL
brk_windows #0
-; Total bytes of code: 48+; Total bytes of code: 44

Diffs:

benchmarks.run.windows.arm64.checked.mch:
Total bytes of delta: -6520 (-0.04 % of base)
coreclr_tests.pmi.windows.arm64.checked.mch:
Total bytes of delta: -2800 (-0.00 % of base)
libraries.pmi.windows.arm64.checked.mch:
Total bytes of delta: -35716 (-0.07 % of base)
libraries_tests.pmi.windows.arm64.checked.mch:
Total bytes of delta: -32000 (-0.02 % of base)

[ghost]

Tagging subscribers to this area: @JulieLeeMSFT
See info in area-owners.md if you want to be subscribed.

Issue Details

---

objectTest(object[]array,inti)=>array[i];

; Method Tests4:Test(System.Object[],int):System.Object:this
G_M52569_IG01:
stp fp, lr, [sp,#-16]!
mov fp, sp
G_M52569_IG02:
ldr w0, [x1,#8]
cmp w2, w0
bhs G_M52569_IG04
- ubfiz x0, x2, #3, #32- add x0, x0, #16- ldr x0, [x1, x0]+ add x0, x1, #16+ ldr x0, [x0, w2, UXTW #3]
G_M52569_IG03:
ldp fp, lr, [sp],#16
ret lr
G_M52569_IG04:
bl CORINFO_HELP_RNGCHKFAIL
brk_windows #0
-; Total bytes of code: 48+; Total bytes of code: 44

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

[EgorBo]

/azp list

[EgorBo]

/azp run runtime-coreclr jitstressregs, runtime-coreclr gcstress0x3-gcstress0xc, runtime-coreclr outerloop

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[EgorBo]

/azp run runtime-coreclr outerloop

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[EgorBo]

/azp run runtime-coreclr jitstressregs, runtime-coreclr gcstress0x3-gcstress0xc

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).