[LoongArch] Initial implementation for enableMemCmpExpansion hook
#166526
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After overriding `TargetTransformInfo::enableMemCmpExpansion` in this commit, `MergeICmps` and `ExpandMemCmp` passes will be enabled on LoongArch.
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After overriding
TargetTransformInfo::enableMemCmpExpansionin this commit,MergeICmpsandExpandMemCmppasses will be enabled on LoongArch.