Fix GH-15656: php8.4beta4 JIT erronous results #15732
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Force load values into regesters before any branches to guarantee SSA dominance property
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GH-15656 reports the failures found by a "puzzle" suite.
Actually, there are 5 different bugs, and each commit fixes an independent JIT problem.
I don't add test cases, because separating them takes much more time than the fixing.