cmd/compile: fix mergelocals for arm32/s390x/riscv64 LoweredZero on arm32 and s390x also take an end-of-zero-range address. That input is also an address sink. Also allow propagation of addresses from input to output of a value, so that we handle at least simple address arithmetic. This is required to fix riscv64 because it has no indexed load/store, and thus does a bunch more explicit address arithmetic than other archs. Fixes #80484 Change-Id: I126eec1e2cc6c2ab5a39611ccc4d3371dca28292 Reviewed-on: https://go-review.googlesource.com/c/go/+/803660 Reviewed-by: Junyang Shao <shaojunyang@google.com> Reviewed-by: David du Colombier <0intro@gmail.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@google.com> Auto-Submit: Keith Randall <khr@golang.org>
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