[dev.simd] cmd/compile: keep track of multiple rule file names in ssa/_gen
This was a long-standing "we need to fix this"
for simd work, this fixes it. I expect that
simd peephole rule files will be coming soon
and there will be more errors and we will be
happier to have this.
Change-Id: Iefffc43e3e2110939f8d406f6e5da7e9e2d55bd9
Reviewed-on: https://go-review.googlesource.com/c/go/+/694455 Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>