Speculative hoisting in licm pass #84323
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# Conflicts: # SwiftCompilerSources/Sources/Optimizer/FunctionPasses/LoopInvariantCodeMotion.swift
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This PR introduces unconditional hoisting of simple instructions without side effects such as
function_ref,integer_literal, orstruct_element_addr. It also adds licm support forColdBlockInfoto speculatively hoist instructions that dominate all non-cold exits.