x/text/unicode/norm: apparent deadlock on js-wasm

[gopherbot]

#!watchflakes
post <- pkg == "golang.org/x/text/unicode/norm" && test == ""

Issue created automatically to collect these failures.

Example (log):

*** Test killed with quit: ran too long (11m0s).

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "golang.org/x/text/unicode/norm" && test == ""

2022-11-09 15:35 js-wasm text@ada74731 go@db259cdd x/text/unicode/norm (log)

*** Test killed with quit: ran too long (11m0s).

— watchflakes

[bcmills]

(attn @golang/js)

From sampling some recent logs, it appears that this test normally completes in around 12.5s, so this is an outlier by a factor of 50. That suggests a possible deadlock in the test or one of its dependencies; since the test itself didn't panic when it hit the timeout, the deadlock may be in either the Go runtime or the node.js environment that runs it.