arch-x86: Specialize LLDT for 64 bit and non-64 bit.

In 64 bit mode the LLDT has a 128 bit descriptor which takes up two
slots. In any other mode, the descriptor is still 64 bits.

Change-Id: I88d3758a66dec3482153df5ec08565427d6c9269
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/55884
Maintainer: Gabe Black <gabe.black@gmail.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed