[dynarmic] fix sporadic crashes on high reg pressure

src/dynarmic/src/dynarmic/backend/x64/hostloc.h

@@ -131,9 +131,12 @@ const HostLocList any_gpr = {
 };
 
 // XMM0 is reserved for use by instructions that implicitly use it as an argument
+// XMM1 is used by 128 mem accessors
+// XMM2 is also used by that (and other stuff)
+// Basically dont use either XMM0, XMM1 or XMM2 ever; they're left for the regsel
 const HostLocList any_xmm = {
-    HostLoc::XMM1,
-    HostLoc::XMM2,
+    //HostLoc::XMM1,
+    //HostLoc::XMM2,
     HostLoc::XMM3,
     HostLoc::XMM4,
     HostLoc::XMM5,

src/dynarmic/src/dynarmic/backend/x64/reg_alloc.cpp

@@ -571,7 +571,7 @@ HostLoc RegAlloc::FindFreeSpill(bool is_xmm) const noexcept {
     if (!is_xmm) {
         // TODO(lizzie): Using lower (xmm0 and such) registers results in issues/crashes - INVESTIGATE WHY
         // Intel recommends to spill GPR onto XMM registers IF POSSIBLE
-        for (size_t i = size_t(HostLoc::XMM15); i >= size_t(HostLoc::XMM0); --i)
+        for (auto const i : any_xmm)
             if (const auto loc = HostLoc(i); LocInfo(loc).IsEmpty())
                 return loc;
     }