[dynarmic] fix 12th-gen Intel CPUs crashing due to UMONITOR (#3954)

see https://github.com/herumi/xbyak/issues/255

> Proof: https://godbolt.org/z/9vseq4Ynj
> Xbyak currently implements it as:
> ```c++
> void umonitor(const Reg& r) {
> int idx = r.getIdx();
> if (idx > 7) XBYAK_THROW(ERR_BAD_PARAMETER) //umonitor DOES accept r8,r9,r10,etc this is NOT correct
> int bit = r.getBit();
> if (BIT != bit) {
>   if ((BIT == 32 && bit == 16) || (BIT == 64 && bit == 32)) {
>     db(0x67);
>   } else {
>     XBYAK_THROW(ERR_BAD_SIZE_OF_REGISTER)
>   }
> }
> db(0xF3); db(0x0F); db(0xAE); setModRM(3, 6, idx);
> }
> ```
> My program was throwing Xbyak::Exception and I tracked it down to this particular umonitor

Signed-off-by: lizzie <lizzie@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3954
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/dynarmic/src/dynarmic/common/spin_lock_x64.cpp

@@ -26,6 +26,7 @@ void EmitSpinLockLock(Xbyak::CodeGenerator& code, Xbyak::Reg64 ptr, Xbyak::Reg32
     Xbyak::Label start, loop;
     code.jmp(start, code.T_NEAR);
     code.L(loop);
+
     if (waitpkg) {
         // TODO: this is because we lack regalloc - so better to be safe :(
         code.push(Xbyak::util::rax);
@@ -33,7 +34,14 @@ void EmitSpinLockLock(Xbyak::CodeGenerator& code, Xbyak::Reg64 ptr, Xbyak::Reg32
         code.push(Xbyak::util::rdx);
         // TODO: This clobbers EAX and EDX did we tell the regalloc?
         // ARM ptr for address-monitoring
-        code.umonitor(ptr);
+
+        // XBYAK BUG: code.umonitor(ptr); see issue #255
+        // replace once xbyak has been fixed
+        code.db(0xF3);
+        if (ptr.getIdx() >= 8) code.db(0x41);
+        code.db(0x0F); code.db(0xAE);
+        code.db(uint8_t((3 << 6) | ((6 & 7) << 3) | (ptr.getIdx() & 7)));
+
         // tmp.bit[0] = 0: C0.1 | Slow Wakup | Better Savings
         // tmp.bit[0] = 1: C0.2 | Fast Wakup | Lesser Savings
         // edx:eax is implicitly used as a 64-bit deadline timestamp