cpu-o3: Manually flatten the index for vector reg elements.
There is a function for this purpose in RegId called flatIndex(), which
I had attempted to use with PhysRegId which inherits from RegId.
Unfortunately, PhysRegId redefines the flatIndex() method and makes it
do something completely different, which is to turn map the index into a
linearization of all registers in the CPU.
Instead of using the decoy wrong method, and because the one we actually
want is not accessible, we can just manually compute the flattened index
in the two places we use it.
Change-Id: I8bd02f0be0f4fb3742da48b2955e9e75ec57245b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/52603
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
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