[release-branch.go1.16] text/template: add lock for Template.tmpl to fix data race

This adds a new lock protecting "tmpl".

This is a copy of https://golang.org/cl/257817 by Andreas Fleig,
updated for current tip, and updated to start running the
html/template TestEscapeRace test.

Thanks to @bep for providing the test case.

For #39807
Fixes #47042

Change-Id: Ic8874484290283a49116812eeaffb8608346dc70
Reviewed-on: https://go-review.googlesource.com/c/go/+/316669
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
(cherry picked from commit 496d7c691481966fd6ea806205aa025698a172af)
Reviewed-on: https://go-review.googlesource.com/c/go/+/348580
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
4 files changed
tree: cc71399b245402457a071036ac442178135ddc53
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  13. favicon.ico
  16. README.md
  17. robots.txt
  18. SECURITY.md

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