Summary:
Add support for the following instructions:
* MUL (indexed and unpredicated vectors forms)
* SQDMULH (indexed and unpredicated vectors forms)
* SQRDMULH (indexed and unpredicated vectors forms)
* SMULH (unpredicated, predicated form added in SVE)
* UMULH (unpredicated, predicated form added in SVE)
* PMUL (unpredicated)
The specification can be found here:
https://developer.arm.com/docs/ddi0602/latest
Reviewed By: SjoerdMeijer, rovka
Differential Revision: https://reviews.llvm.org/D61902
llvm-svn: 360867
