This patch adds asserts to `getStackSizeSVE()` and
`getSVECalleeSavedStackSize()` to check they are only called after the
SVE stack size has been determined.
This patch then fixes issues in three places:
* `AArch64FrameLowering::homogeneousPrologEpilog()`
- This function is called before callee saves or SVE stack sizes have
been determined
- This check has been updated to use `isLikelyToHaveSVEStack()`
- `isLikelyToHaveSVEStack()` conservatively returns if a function is
likely to have an SVE stack
* `produceCompactUnwindFrame()`
- This function checked the SVE CS stack size before callee-saves had
been determined
- This has been replaced with a more conservative `isSVECC()` check
* `AArch64FrameLowering::resolveFrameOffsetReference()`
- This was hit by some post-PEI MIR tests
- This case was fixed by adding "stackSizeSVE" to the YAML for
`AArch64FunctionInfo`
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