ARM64: Move from FPRegister to VRegister based API (continued (2)).

Move newly added occurrences of `vixl::aarch64::FPRegister` to
`vixl::aarch64::VRegister` in `compiler/optimizing/common_arm64.h`.

Test: mmma art
Bug: 144490441
Change-Id: Id343d64fa00373994db7bf11f5e737cca3a4f2fd
1 file changed