refactor(allocator): Use & instead of a thread-local

[kdy1]

Description:

This is a part of #9230. I profiled the performance, and thread_local took too long to get the address of the thread-local variable. So, I inlined the reference into the allocator.

Benchmark result

Gnuplot not found, using plotters backend
common/allocator/alloc/std/1000000
                        time:   [4.9478 ms 4.9653 ms 4.9922 ms]
Found 17 outliers among 100 measurements (17.00%)
  4 (4.00%) high mild
  13 (13.00%) high severe

common/allocator/alloc/no-scope/1000000
                        time:   [5.4821 ms 5.4938 ms 5.5068 ms]
Found 17 outliers among 100 measurements (17.00%)
  2 (2.00%) high mild
  15 (15.00%) high severe

common/allocator/alloc/scoped/1000000
                        time:   [3.1401 ms 3.1456 ms 3.1518 ms]
Found 12 outliers among 100 measurements (12.00%)
  3 (3.00%) high mild
  9 (9.00%) high severe

common/allocator/alloc/cached-no-scope/1000000
                        time:   [5.0992 ms 5.1090 ms 5.1198 ms]
Found 11 outliers among 100 measurements (11.00%)
  2 (2.00%) high mild
  9 (9.00%) high severe

common/allocator/alloc/cached-scoped/1000000
                        time:   [3.0191 ms 3.0230 ms 3.0273 ms]
Found 11 outliers among 100 measurements (11.00%)
  2 (2.00%) low mild
  1 (1.00%) high mild
  8 (8.00%) high severe

[kdy1]

swc-bump:

• swc_allocator

[codspeed-hq]

CodSpeed Performance Report

Merging #9235 will not alter performance

_{Comparing kdy1:ptr2 (8f7e866) with main (037dad5)}

Summary

✅ 178 untouched benchmarks