Stdlib: AOT mb_substr_count() runtime encoding via NestedJIT (#35155)

[PurHur]

Summary

• AOT mb_substr_count(..., $encoding) with a runtime encoding string no longer throws LogicException — NestedJIT assertEncodingArgv (Argument Stdlib: ceil, floor, intval and expanded PHPT specs #3), peer #34884 / leftover of #4637.
• Invalid runtime encoding → catchable ValueError (not compile-time LogicException / SIGSEGV).
• Closes AOT: mb_substr_count() refuses runtime encoding — LogicException (leftover of #4637, ext/mbstring/mbstring.c) #35155

php-src

• ext/mbstring/mbstring.c — PHP_FUNCTION(mb_substr_count) Argument Stdlib: ceil, floor, intval and expanded PHPT specs #3 $encoding

Test plan

• ./script/aot-smoke.sh → 8 passed, 0 failed
• Issue repro (Zend / VM / AOT identical):

  count=3
  ascii=3
  jp=2
  bad_enc=mb_substr_count(): Argument #3 ($encoding) must be a valid encoding, "nope" given
  

• ./script/phpunit.sh --filter MbSubstrCountRuntimeAotTest → OK (3 tests, 19 assertions)

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