[release-branch.go1.19] cmd/compile: turn off jump tables when spectre retpolines are on
Fixes #57100
Change-Id: I6ab659abbca1ae0ac8710674d39aec116fab0baa
Reviewed-on: https://go-review.googlesource.com/c/go/+/455336
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
(cherry picked from commit
1eb0465fa596a2d6e9c1a632499989544f0d7e68)
Reviewed-on: https://go-review.googlesource.com/c/go/+/455416
Reviewed-by: Michael Pratt <mpratt@google.com>