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Fix GH-24396: Assertion failure in zend_jit_def_reg() "reg forwarding" with chained Pi nodes - #24403

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ndossche:fix-24396
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ndossche wants to merge 1 commit into
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ndossche:fix-24396

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It's possible for back-edge Pi nodes, that it gets forwarded, but due to the ordering in which BBs are generated, that at the point it wants to get forwarded that it was not generated yet.

…ing" with chained Pi nodes

It's possible for back-edge Pi nodes, that it gets forwarded, but due to
the ordering in which BBs are generated, that at the point it wants to
get forwarded that it was not generated yet.
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JIT: "reg forwarding" assertion in zend_jit_def_reg (segfault in release) on masked counter loop, opcache.jit=function

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