The nullStaticInstPtr was low overhead, but the nopStaticInstPtr needed
an actual StaticInst implementation it could point to, and that brought
with it some (minor) additional dependencies. Specifically, the
implementation of advancePC needs the definition of TheISA::PCState,
while all other signatures/impementations in StaticInst are already
passing around that type by reference or could be made to, reducing
dependencies further.
Change-Id: I9ac6a6e5a3106858ea1fc727648f61dc39738a59
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/42968
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
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