refactor(parser): simplify parsing extends clause

[Dunqing]

I am trying to reserve space for non-empty Vec, and I came across this method has two of the same logic parsing extends clause.

[Dunqing]

• perf(parser): pre-allocate enough space in ArrayExpression and ObjectExpressions conversion #9776
• refactor(parser): simplify parsing extends clause #9773 👈 (View in Graphite)
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #9773 will not alter performance

_{Comparing 03-14-refactor_parser_simplify_parsing_extends_clause (3945385) with main (caa477c)}

Summary

✅ 33 untouched benchmarks

[graphite-app]

Merge activity

• Mar 14, 5:06 AM EDT: A user added this pull request to the Graphite merge queue.
• Mar 14, 5:11 AM EDT: A user merged this pull request with the Graphite merge queue.