cmd/compile: move arm64 over to new bounds check strategy

cmd/compile: move arm64 over to new bounds check strategy

For all the static bounds checks in cmd/go, we have:

    6877    just a single instruction (the call itself)
    139     needs an additional reg-reg move
    602     needs an additional constant load
    25      needs some other instruction

that's ~90% implemented using just a single instruction.

Reduces the text size of cmd/go by ~0.8%.
Total binary size is just barely smaller, ~0.2%. (The difference
is the new pcdata table.)

Change-Id: I416e9c196f5d8d0e8f08e191e6df3045e11dccbe
Reviewed-on: https://go-review.googlesource.com/c/go/+/682496
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>