[CIR] Implement `CGM.getIntrinsic` for `LLVMCallIntrinsicOp`#1710

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RiverDave wants to merge 2 commits intollvm:mainfrom

RiverDave:dave/get-intrinsic

Commits on Jun 21, 2025

[CIR] Add Intrinsic handling skeleton
RiverDave
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Commits on Jun 23, 2025

Refactor intrinsic handling: rename namespace to `CIRIntrinsic` and introduce `IntrinsicDescriptor` struct for better intrinsic management
RiverDave
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