[AMDGPU] [GlobalIsel] Combine Fmul with Select into ldexp instruction.#120104

Merged

vg0204 merged 7 commits intollvm:mainfrom

vg0204:vg0204/combine-fmul-with-select-gloabalIsel

Jan 6, 2025

Commits on Jan 6, 2025

[AMDGPU] [GlobalIsel] Combine Fmul with Select into ldexp.
vg0204
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Invoking the fmulCombine in both the AMDGPUPreLegalCombine and AMDGPUPostLegalCombiner.
vg0204
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updated the testCases, and increased the coverage of dagCombine-fmul-to-ldexp to include globalIsel in pipeline as well.
vg0204
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Addressed suggested reviewed changes.
vg0204
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Added constructor with TII in AMDGPUCombinerHelper to propagate it from Pre/Post legalizeCombiner.
vg0204
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Utilized isConstantOrConstantSplatFP API in matchCombine function.
vg0204
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Addressed a suggested change regarding early false return.
vg0204
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