Speed up the parser #153568

This is a catch-all issue to track a series of small, independent speedups to the parser

Linked PRs

• gh-153568: Skip parser memo lookups that cannot match #153571
• gh-153568: Make the parser's per-rule stack check an inline comparison #153573
• gh-153568: Stop re-walking memo lists when growing left-recursive rules #153574
• gh-153568: Skip the expression precedence chain for single-token atoms #153575
• gh-153568: Don't materialize parser token text that is never read #153576
• gh-153568: Cache repeated identifiers while parsing #153577
• gh-153568: Pause the GC while converting the AST to Python objects #153583
• gh-153568: Skip newline translation for source without carriage returns #153584
• gh-153568: Use FIRST sets to speed up parser choices #156209
• gh-153568: Reduce parser allocations #157374
• gh-153568: Parse arithmetic with operator loops #157413
• gh-153568: Factor shared prefixes in expression rules #157437
• gh-153568: Share expression parsing with assignment targets #157450
• gh-153568: Reuse shared prefixes in generated parser rules #157465