I32x4 Mul, MinS,MaxS,MinU,MaxU, Shl,ShrS,ShrU
Rename WASM_SIMD_TEST(I32x4Min) to WASM_SIMD_TEST(I32x4MinS)

Bug: 
Change-Id: I6c721496bbf772ee734c21a3e98176699b01f890
Reviewed-on: https://chromium-review.googlesource.com/586430Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46950}