[libunwind] [llvm] [LFI][AArch64] Add AArch64 LFI rewriter (PR #184277)

[Alexis Engelke via cfe-commits]

================
@@ -678,9 +678,15 @@ DEFINE_LIBUNWIND_FUNCTION(__libunwind_Registers_arm64_jumpto)
   ldp    x18,x19, [x0, #0x090]
   ldp    x20,x21, [x0, #0x0A0]
   ldp    x22,x23, [x0, #0x0B0]
+#ifndef __LFI__
   ldp    x24,x25, [x0, #0x0C0]
   ldp    x26,x27, [x0, #0x0D0]
   ldp    x28,x29, [x0, #0x0E0]
+#else
+  ldp    x24,xzr, [x0, #0x0C0]
+  ldp    x26,xzr, [x0, #0x0D0]
+  ldp    xzr,x29, [x0, #0x0E0]
----------------
aengelke wrote:

ldr? Add explaining comment.

https://github.com/llvm/llvm-project/pull/184277