Revert "riscv64: Optimize IR using bit manipulation"

This reverts commit 022f0bd86b5d9c12992508e8c19e6bce230b2b98.

Reason for revert: Droidmonitor created revert due to b/435722878. Will be verifying through ABTD before submission.

Fix: 435722878
Change-Id: Iafa31631d039e87b81e9e87f89be2e69ea4bf5cb
9 files changed