Use AVX512 to zero locals

[EgorBo]

Extends #32538 to use AVX-512 (and AVX1) to zero locals for non-loop path. I am going to slightly refactor it to use AVX in the loop path too but later, this seems to be a low-hanging fruit with nice diffs.

Diff example:

@@ -17,17 +17,13 @@ G_M59697_IG01: ; bbWeight=1, gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, push rbx sub rsp, 160 vxorps xmm4, xmm4, xmm4 - vmovdqa xmmword ptr [rsp+0x20], xmm4 - vmovdqa xmmword ptr [rsp+0x30], xmm4 - mov rax, -96 - vmovdqa xmmword ptr [rsp+rax+0xA0], xmm4 - vmovdqa xmmword ptr [rsp+rax+0xB0], xmm4 - vmovdqa xmmword ptr [rsp+rax+0xC0], xmm4 - add rax, 48 - jne SHORT -5 instr + vmovdqu ymmword ptr [rsp+0x20], ymm4 + vmovdqu ymmword ptr [rsp+0x40], ymm4 + vmovdqu ymmword ptr [rsp+0x60], ymm4 + vmovdqu ymmword ptr [rsp+0x80], ymm4 mov rbx, rcx ; gcrRegs +[rbx] -;; size=70 bbWeight=1 PerfScore 13.33 +;; size=42 bbWeight=1 PerfScore 9.83 G_M59697_IG02: ; bbWeight=1, gcrefRegs=0008 {rbx}, byrefRegs=0000 {}, byref lea rcx, [rsp+0x20] call [<unknown method>] @@ -46,7 +42,7 @@ G_M59697_IG03: ; bbWeight=1, epilog, nogc, extend ret	;; size=9 bbWeight=1 PerfScore 1.75

(apparently this collection has no avx-512, but still looks better)

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Issue Details

---

Extends #32538 to use AVX-512 (and AVX1) to zero locals for non-loop path. I am going to slightly refactor it to use AVX in the loop path too but later, this seems to be a low-hanging fruit with nice diffs.

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

[EgorBo]

@dotnet/jit-contrib PTAL, simple change with nice diffs (-122kb for benchmarks.pgo collection, -0.13% TP for the same collection).

The logic has plenty of opportunities to optimize futher, e.g. use AVX in the loop - I didn't change it here because for that we need to align data to 32/64 bytes + remainder can be handled with overlapping -- but I am leaving it for future follow ups. I was mostly interested in removing loops by allowing up to 6*64=384 bytes to be zeroed directly with avx512 where previously we switched to the loop for >96 bytes.

[EgorBo]

Improvements on x64:

• [Perf] Linux/x64: 22 Improvements on 9/2/2023 9:37:00 AM perf-autofiling-issues#21207
• [Perf] Linux/x64: 18 Improvements on 8/28/2023 7:02:26 PM perf-autofiling-issues#21204