cmd/compile: use addressing modes pass on s390x

Add s390x support to the addressing modes pass. This significantly
reduces the number of rules we need to have to handle indexed
addressing modes on s390x.

There are some changes introduced with the new approach. Notably
pointer calculations of the form '(ADD x (ADDconst y [c]))' won't
get fully merged into address fields right now, the constant offset
will remain separate. That is a relatively minor issue though.

file      before    after     Δ       %
addr2line 4120904   4120960   +56     +0.001%
api       4944005   4948765   +4760   +0.096%
asm       4977431   4984335   +6904   +0.139%
buildid   2683760   2683504   -256    -0.010%
cgo       4557976   4558408   +432    +0.009%
compile   19103577  18916634  -186943 -0.979%
cover     4883694   4885054   +1360   +0.028%
dist      3545177   3553689   +8512   +0.240%
doc       3921766   3921518   -248    -0.006%
fix       3295254   3302182   +6928   +0.210%
link      6539222   6540286   +1064   +0.016%
nm        4105085   4107757   +2672   +0.065%
objdump   4546015   4545439   -576    -0.013%
pack      2416661   2415485   -1176   -0.049%
pprof     13267433  13265489  -1944   -0.015%
test2json 2762180   2761996   -184    -0.007%
trace     10145090  10135626  -9464   -0.093%
vet       6772946   6771738   -1208   -0.018%
total     106588176 106418865 -169311 -0.159%

Fixes #37891.

Change-Id: If60d51f31eb2806b011432a6519951b8668cb42f
Reviewed-on: https://go-review.googlesource.com/c/go/+/250958
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
3 files changed
tree: cc06f1ebe6cfbc63499509f5d0503ef42fe111f9
  1. .gitattributes
  2. .github/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTING.md
  6. CONTRIBUTORS
  7. LICENSE
  8. PATENTS
  9. README.md
  10. SECURITY.md
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
  16. robots.txt
  17. src/
  18. test/
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