arch-x86: Subtract the base from the PC when entering faults.
arch-x86: Subtract the base from the PC when entering faults.

The PC value is put in t7, but for that to be consistent with the way
microcode usually sees and interacts with the PC, it needs to have the
CS base value subtracted from it first. Otherwise the base could be
added into new PC values twice.

Change-Id: I8a8c5bc1befd9a89e6735981fd2fc69a702fdc68
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/55690
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Gabe Black <d3e8afea784ab4a50a2dbf9149d2eaa8478e1cbc@gmail.com>
Maintainer: Gabe Black <d3e8afea784ab4a50a2dbf9149d2eaa8478e1cbc@gmail.com>

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