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[PowerPC] Implemented Vector Multiply Builtins

Authored by Conanap on Sep 2 2020, 12:16 PM.

Description

[PowerPC] Implemented Vector Multiply Builtins

This patch implements the builtins for Vector Multiply Builtins (vmulxxd family of instructions), and adds the appropriate test cases for these builtins. The builtins utilize the vector multiply instructions itnroduced with ISA 3.1.

Differential Revision: https://reviews.llvm.org/D83955