[php-src] Issue #9068: Conditional jump or move depends on uninitialised value(s)

Issue: https://github.com/php/php-src/issues/9068 Author: NathanFreeman ### Description The following code: ```php valgrind --track-origins=yes php run-tests.php ext/dom/tests/canonicalization.phpt ``` Resulted in this output: ``` ==13849== Conditional jump or move depends on uninitialised value(s) ==13849== at 0x4070622: ??? ==13849== by 0x7358017: ??? ==13849== by 0x7358017: ??? ==13849== by 0x7358784: ??? ==13849== by 0x6ED2B9F: ??? ==13849== by 0x7358017: ??? ==13849== Uninitialised value was created by a stack allocation ==13849== at 0x86D650: zend_delayed_compile_dim (zend_compile.c:2743) ==13849== ``` But I expected this output instead: ``` ``` ### PHP Version PHP 8.0+ ### Operating System Centos7.9.2003