perf: reduce memory usage in profiling

[morrisonlevi]

Description

Utilizes ThinStr in the ZendFrame to shrink memory. This shrinks each frame from 7 words to 3 words.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[pr-commenter]

Benchmarks [ profiler ]

Benchmark execution time: 2024-12-16 23:18:19

Comparing candidate commit 5d13085 in PR branch levi/thin-zend-frame with baseline commit 53a8da7 in branch levi/thin-str.

Found 0 performance improvements and 6 performance regressions! Performance is the same for 23 metrics, 7 unstable metrics.

scenario:walk_stack/1

• 🟥 wall_time [+4.217µs; +4.221µs] or [+35.743%; +35.780%]

scenario:walk_stack/50

• 🟥 wall_time [+4.236µs; +4.247µs] or [+29.190%; +29.273%]

scenario:walk_stack/99

• 🟥 wall_time [+4.469µs; +4.474µs] or [+30.895%; +30.928%]

scenario:walk_stack_instructions/1

• 🟥 instructions [+23.6K instructions; +23.6K instructions] or [+23.572%; +23.575%]

scenario:walk_stack_instructions/50

• 🟥 instructions [+33.7K instructions; +33.7K instructions] or [+33.355%; +33.356%]

scenario:walk_stack_instructions/99

• 🟥 instructions [+35.9K instructions; +35.9K instructions] or [+35.404%; +35.421%]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.56%. Comparing base (53a8da7) to head (5d13085).

Additional details and impacted files

@@               Coverage Diff                @@
##             levi/thin-str    #2995   +/-   ##
================================================
  Coverage            74.56%   74.56%           
  Complexity            2750     2750           
================================================
  Files                  111      111           
  Lines                10900    10900           
================================================
  Hits                  8128     8128           
  Misses                2772     2772           

Flag	Coverage Δ
tracer-php	74.56% <ø> (ø)

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