arch-x86: Straighten out the segment and selector for real far jumps.

These had been partially transposed in the microcode for this
instruction.

Change-Id: Ida31e74d5096c6b8cf77dc49b9a0f480c1358009
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/55591
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/arch/x86/isa/insts/general_purpose/control_transfer/jump.py

@@ -153,12 +153,12 @@ def macroop JMP_FAR_REAL_M
     lea t1, seg, sib, disp, dataSize=asz
     ld t2, seg, [1, t0, t1], dsz
     ld t1, seg, [1, t0, t1]
-    zexti t3, t1, 15, dataSize=8
+    zexti t3, t2, 15, dataSize=8
     slli t3, t3, 4, dataSize=8
-    wrsel cs, t1, dataSize=2
+    wrsel cs, t2, dataSize=2
     wrbase cs, t3, dataSize=8
-    # Put t2 first so it isn't sign extended.
-    wrip t2, t0
+    # Put t1 first so it isn't sign extended.
+    wrip t1, t0
 };
 
 def macroop JMP_FAR_REAL_P