cpu,arch-arm: Use a sentry class valid for invalid RegIds.
The default constructor for RegId would initialize it with the
IntRegClass and register index 0. This is arbitrary and
indistinguishable from a real ID to the first integer register.
Instead, add a new class type constant InvalidRegClass, and use that to
initialize an otherwise uninitialized RegId.
Also, fill out some enums that needed to handle that value to silence
compiler warnings.
Change-Id: I3b58559f41adc1da5f661121225dbd389230e3af
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49710
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
3 files changed
