[llvm] [X86]Support lowering for APX Promoted SHA/MOVDIR/CRC32/INVPCID instructions (PR #76786)

[Phoebe Wang via llvm-commits]

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@@ -0,0 +1,50 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-apple-darwin -mattr=+shstk,+egpr --show-mc-encoding | FileCheck %s
+
+define void @test_wrssd(i32 %a, ptr %__p) {
+; CHECK-LABEL: test_wrssd:
+; CHECK:       ## %bb.0: ## %entry
+; CHECK-NEXT:    wrssd %edi, (%rsi) ## encoding: [0x62,0xf4,0x7c,0x08,0x66,0x3e]
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phoebewang wrote:

Should to optimize back to legacy encoding? The same below.

https://github.com/llvm/llvm-project/pull/76786