[AMDGCN][SIWholeQuadMode] Rework splitBlock/lowerKillI1/lowerKillF32 to handle case when SI_KILL_I1_TERMINATOR -1 0 is not the unique terminator The lowerKillI1 method wrongly handled cases where it inserted a new S_BRANCH instruction when the kill was not the only terminator, and then tried to split the block. `SI_KILL_I1_TERMINATOR -1,0` doesn't have any effect. Instead of lowering to an unconditional branch, we remove the instruction and insert an unconditional branch only if the instruction is the last terminator. No split is needed in this case (if the last terminator has been reached, then the whole block was processed). Also stop generating an unconditional branch in splitBlock: this branch was redundant since TermMI is promoted to a terminator that fallsthrough to the next block already. Solves SWDEV-508819
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