Language: INF/NAN→int untyped coerce emits E_DEPRECATED (#27926)

[PurHur]

Summary

• Treat non-finite floats as precision-loss for untyped float→int (VmMath::floatLosesIntPrecision), matching Zend zend_dval_to_lval E_DEPRECATED text (INF/-INF/NAN).
• JIT: warn when !is_finite (round-trip fcmp misses poison from fptosi of Inf/NaN); boxed float→long via floatToLongWithPrecisionWarning; dim-read non-finite only (finite fractional silence remains Language: float array dim read/isset/unset silent — Zend E_DEPRECATED (re-#16739, Zend/zend_execute.c) #27948).
• Typed weak int left for Language: weak typed int accepts INF/NAN — Zend TypeError (zend_operators.c zend_dval_to_lval_safe) #27925 (no deprecation on that path).

Closes #27926

Test plan

• Issue repro: Zend / VM / JIT byte-identical

./script/docker-exec.sh -- bash -lc 'php test/repro/issue_27926_inf_nan_int_deprecated.php > /tmp/z.out
php bin/vm.php test/repro/issue_27926_inf_nan_int_deprecated.php > /tmp/v.out
php bin/jit.php test/repro/issue_27926_inf_nan_int_deprecated.php 2>/dev/null > /tmp/j.out
diff -u /tmp/z.out /tmp/v.out && diff -u /tmp/z.out /tmp/j.out'

• vendor/bin/phpunit test/compliance/InfNanToIntDeprecatedVMTest.php
• vendor/bin/phpunit test/compliance/InfNanToIntDeprecatedJITTest.php
• vendor/bin/phpunit test/compliance/ArrayFloatKeyWriteDeprecatedVMTest.php
• float_bitwise_deprecate expect still matches on VM
• Not run: full ci-fast / north-star5-verify-fast (pre-existing gen-0 mismatch Self-host M5: bootstrap-inventory argv driver size floor — grow beyond 451KB stub #8713 on master)

Trust snapshot (pre-work)

• bootstrap-inventory --check: OK 7078/7078
• release-readiness --json: north-star5-fast fail (gen-0 manifest/driver mismatch Self-host M5: bootstrap-inventory argv driver size floor — grow beyond 451KB stub #8713) — pre-existing

php-src reference

Zend/zend_operators.c — zend_dval_to_lval / implicit float→long deprecation

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