[pull] master from php:master #355
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Polymorphic calls pass this and the function to side traces via snapshotting. However, we assume that this/func are in registers, when in fact they may be spilled. Here I update snapshotting of poly_func/poly_this to support spilling: - In zend_jit_snapshot_handler, keep track of the C stack offset of the spilled register, in a way similar to how stack variables. - In zend_jit_start, do not pre-load the registers if they were spilled. - In zend_jit_trace_exit / zend_jit_trace_deoptimization, load from the stack if the register was spilled. - Store a reference to poly_func/poly_this in zend_jit_ctx so we can use that directly in the side trace. Closes GH-18408
* PHP-8.4: Snapshotted poly_func / poly_this may be spilled
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