spirv: Update SPIR-V grammar to use aliases
For enumerants and instruction names, instead of duplicating the values now the grammar will use an aliases field to list the alternative names. Update the Python scripts for that.
The new SPIR-V files correspond to d92cf88c371424591115a87499009dfad41b669c ("Add "aliases" fields to the grammar and remove duplicated (#447 (closed))") in https://github.com/KhronosGroup/SPIRV-Headers.
Edited by Caio Oliveira