Fix GH-13931: Applying zero offset to null pointer in Zend/zend_opcode.c

In the test cases, the compiler bails out due to a fatal error.
The data structures used by the compiler will con

Fix GH-13931: Applying zero offset to null pointer in Zend/zend_opcode.c

In the test cases, the compiler bails out due to a fatal error.
The data structures used by the compiler will contain stale values.
In particular, for the test case CG(loop_var_stack) will contain data.
The next compilation will incorrectly use elements from the previous
stack.
To solve this, we reset part of the compiler data structures.
We don't do a full re-initialization via init_compiler() because that will
also reset streams and resources.

Closes GH-13938.

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