Compiler: fix @settype + var_export(gettype()) arg misbind (#8974)

[PurHur]

Summary

• After a standalone @settype() in an END_SILENCE block, var_export(gettype($x)) incorrectly used the @ suppress return slot (true) instead of the adjacent gettype() exec-return slot.
• Adds errorSuppressEndBlockCallArgHasAdjacentNestedFuncCallProducer() guard in both prebind and ARG_SEND paths (lib/Compiler.php).
• Regenerates docs/bootstrap-inventory.md for the new Compiler helper.

Root cause

php-src-strict @ forwarding (#15916) treated the first dead-temp arg of any post-suppress call as the suppressed inner result, even when an immediately preceding sibling gettype() call was the real producer for var_export().

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit --filter settype_backed_enum
vendor/bin/phpunit --filter ErrorSuppressInlineReturnSlotTest
php bin/vm.php test/repro/maintainer_gap_settype_var_export_gettype.php
php bin/vm.php test/compliance/cases/stdlib/settype_backed_enum_int.phpt
'

Output (2026-07-05):

OK (4 tests, 4 assertions)   # settype_backed_enum*
OK (8 tests, 28 assertions) # ErrorSuppressInlineReturnSlotTest
1
'integer'
1
'integer'
1
'integer'

./script/docker-exec.sh -- bash -lc 'make bootstrap-selfhost-link'
# bootstrap-selfhost-link: OK

php script/bootstrap-inventory.php --check
# OK 4036/4036

Closes #8974

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