[llvm] [GlobalISel][AArch64] AArch64O0PreLegalizerCombiner: Disable fixed-point iteration (PR #94291)

[Matt Arsenault via llvm-commits]

arsenm wrote:


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> I don't see where this would be needed. The overwhelming majority of work is done in the first iteration. Limiting the number of iterations to 2 already performs identically to fixed-point iteration on CTMark O2.
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This would better match how instcombine handles this 

https://github.com/llvm/llvm-project/pull/94291