[Parser][NFC] Do less work when parsing function types

[tlively]

After the initial parsing pass to find the locations of all the module elements
and after the type definitions have been parsed, the next phase of parsing is to
visit all of the module elements and parse their types. This phase does not
require parsing function bodies, but it previously parsed entire functions
anyway for simplicity. To improve performance, skip that useless work.

[tlively]

• [Parser][NFC] Do less work when parsing function types #6516 👈
• [Parser][NFC] Improve performance of idchar lexing #6515
• main

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[tlively]

Merge activity

• Apr 19, 7:36 PM EDT: @tlively started a stack merge that includes this pull request via Graphite.
• Apr 19, 7:38 PM EDT: Graphite rebased this pull request as part of a merge.
• Apr 19, 8:07 PM EDT: @tlively merged this pull request with Graphite.