GSA: Fix self-dependent merge conversion in convertSSAToGSAMerge #681
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In
convertSSAToGSAMerges, merges are first translated into SSA phis and then lowered to GSA. The current implementation does not correctly handle the case where a merge depends on its own result. This change detects self-dependent merge operands and reconnects them to the output of the newly created phi after it is generated.