[php-src] PR #24665: JIT: Fix JIT ASSIGN_DIM undefined OP_DATA and dim reporting on non-array containers

Pull Request: https://github.com/php/php-src/pull/24665 Author: jorgsowa In function JIT, zend_jit_assign_dim_helper() read an undefined OP_DATA before checking the container type. The VM reads it only when it actually assigns, so the JIT reported warnings in a different order, or where the VM reports none: | Code | VM | Function JIT | |-------------------------------|------------------------------------------------------|----------------------------------------------------| | $x = 1.5; $x[0] = $undef; | Error: Cannot use a scalar value as an array | extra Undefined variable warning before the Error | | $x = 'ab'; $x[] = $undef; | Error: [] operator not supported for strings | extra Undefined variable warning before the Error | | $x = false; $x[0] = $undef; | Deprecated (false to array), then Undefined variable | Undefined variable, then Deprecated | | $x = 1.5; $x[$undef] = 1; | Error: Cannot use a scalar value as an array | extra Undefined variable warning before the Error | The helper now checks for an undefined value only on the false path, after the deprecation, and no longer reports an undefined key on the scalar path. The generated JIT code is unchanged, and the helper is slightly smaller at -O2 (183 instructions instead of 207 on arm64).