ptondereau / ext-php-rs / 24423222637

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perf: cache property lookups across repeated accesses

When PHP reads or writes an object property (e.g. `$obj->name`), ext-php-rs
previously searched through all registered properties by name on every single
access. In a loop hitting the same property 100k times, that same search ran
100k times.

PHP provides a per-opcode "cache slot" mechanism to avoid this. On the first
access, we now store the resolved property descriptor pointer in the cache
slot. On all subsequent accesses to the same property on the same class, we
skip the search entirely and read the cached pointer directly -- a single
pointer comparison instead of string conversions and linear scans.

Applied to all three property handlers: read, write, and isset/exists.

Benchmarks (callgrind, 100k iterations):
  - Property reads:  235M -> 93.5M instructions (-60%)
  - Property writes: 220M -> 75.7M instructions (-66%)

0 of 38 new or added lines in 1 file covered. (0.0%)

8426 of 12749 relevant lines covered (66.09%)

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