[X86] Avoid Register implicit int conversion

PushedRegisters in this patch needs to be of type int64_t because iot is
grabbing registers from immediate operands of pseudo instructions.
However, we then compare to an actual register type later, which relies
on the implicit conversion within Register to int, which can result in
build failures in some configurations.

Author: boomanaiden154

llvm/lib/Target/X86/X86WinEHUnwindV2.cpp

@@ -235,7 +235,7 @@ bool X86WinEHUnwindV2::runOnMachineFunction(MachineFunction &MF) {
                   MF, Mode,
                   "The epilog is popping more registers than the prolog "
                   "pushed");
-            if (PushedRegs[PushedRegs.size() - PoppedRegCount] != Reg)
+            if (PushedRegs[PushedRegs.size() - PoppedRegCount] != Reg.id())
               return rejectCurrentFunctionInternalError(
                   MF, Mode,
                   "The epilog is popping a registers in "