Revert "Basic SIMD reduction support."

Fails 530-checker-lse on arm64.

Bug: 64091002, 65212948

This reverts commit cfa59b49cde265dc5329a7e6956445f9f7a75f15.

Change-Id: Icb5d6c805516db0a1d911c3ede9a246ccef89a22
17 files changed