[NFC][MI] Tidy Up RegState enum use (2/2) (#177090)
This Change makes `RegState` into an enum class, with bitwise operators.
It also:
- Updates declarations of flag variables/arguments/returns from
`unsigned` to `RegState`.
- Updates empty RegState initializers from 0 to `{}`.
If this is causing problems in downstream code:
- Adopt the `RegState getXXXRegState(bool)` functions instead of using a
ternary operator such as `bool ? RegState::XXX : 0`.
- Adopt the `bool hasRegState(RegState, RegState)` function instead of
using a bitwise check of the flags.
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