cmd/compile: Enable inlining of tail calls

Enable inlining tail calls and do not limit emitting tail calls only to the
non-inlineable methods when generating wrappers. This change produces
additional code size reduction.

 Code size difference measured with this change (tried for x86_64):
    etcd binary:
    .text section size: 10613393 -> 10593841 (0.18%)
    total binary size:  33450787 -> 33424307 (0.07%)

    compile binary:
    .text section size: 10171025 -> 10126545 (0.43%)
    total binary size:  28241012 -> 28192628 (0.17%)

    cockroach binary:
    .text section size:  83947260 -> 83694140  (0.3%)
    total binary size:  263799808 -> 263534160 (0.1%)

Change-Id: I694f83cb838e64bd4c51f05b7b9f2bf0193bb551
Reviewed-on: https://go-review.googlesource.com/c/go/+/650455
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
8 files changed
tree: 2597ca457ed77dc8674ed9b55a5cc3387082a0a3
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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