When lowering calls and tail calls in AArch64, the register mask and

When lowering calls and tail calls in AArch64, the register mask and
return value location depends on the calling convention of the callee.
`F.getCallingConv()`, however, is the caller CC. Correct it to the
callee CC from `CallLoweringInfo`.

Fixes PR43449

Patch by Shu-Chun Weng!