[vim/vim] Reduce startup termcode and UTF-8 scanning work (PR #19902)

[mattn]

This reduces some repeated startup work in find_term_bykeys() and vim_strchr().

Compared with master on normal startup (./vim -c 'qa!'):

Benchmark	master	branch	delta
Callgrind Ir	788,506,178	574,678,633	-27.12%
Hyperfine wall-clock	2.156 s ± 0.018 s	2.153 s ± 0.037 s	no meaningful change

This lowers CPU work in the startup path, but startup time itself stays about the same here because terminal I/O and other external costs still dominate.

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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/19902

Commit Summary

• 5958f21 speed up startup termcode and UTF-8 scans
• 8cb26b5 add startup benchmark against master
• a716e83 remove local benchmark helper script

File Changes

(2 files)

• M src/strings.c (2)
• M src/term.c (7)

Patch Links:

• https://github.com/vim/vim/pull/19902.patch
• https://github.com/vim/vim/pull/19902.diff

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