[VE] setcc isel patterns

Summary: SETCC isel patterns and tests for i32/64 and fp32/64 comparison

Reviewers: arsenm, rengolin, craig.topper, k-ishizaka

Reviewed By: arsenm

Subscribers: merge_guards_bot, wdng, hiraditya, llvm-commits

Tags: #ve, #llvm

Differential Revision: https://reviews.llvm.org/D73171