[PowerPC][NFC] Provide legacy names for VSX loads and stores

Before we unified the names of the builtins across all the
compilers, there were a number of synonyms between them. There
is code out there that uses XL naming for some of these loads and
stores. This just adds those names.

GitOrigin-RevId: 06411edb9fca4a292634511fc7384ffb12651472
1 file changed