860f9e5170
* Introduce field `PositionOrder` for class `Register` and
`RegisterTuples`
* If register A's `PositionOrder` < register B's `PositionOrder`, then A
is placed before B in the enum in X86GenRegisterInfo.inc
* The new order of registers in the enum for X86 will be
1. Registers before AVX512,
2. AVX512 registers (X/YMM16-31, ZMM0-31, K registers)
3. AMX registers (TMM)
4. APX registers (R16-R31)
* Add a new target hook `getNumSupportedRegs()` to return the number of
registers for the function (may overestimate).
* Replace `getNumRegs()` with `getNumSupportedRegs()` in LiveVariables
to eliminate iterations on unsupported registers
This patch can reduce 0.3% instruction count regression for sqlite3
during compile-stage (O3) by not iterating on APX registers
for #67702
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