test/codegen: codify bit related code generation for riscv64
Change-Id: Iba4d3ded15d578e97a978780069e70a51a5e944b
Reviewed-on: https://go-review.googlesource.com/c/go/+/732180
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Nicholas Husin <husin@google.com> Reviewed-by: Meng Zhuo <mengzhuo1203@gmail.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>
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