[AMDGPU] Introduce "amdgpu-uniform-intrinsic-combine" pass to combine uniform AMDGPU lane Intrinsics. (#116953) This pass introduces optimizations for AMDGPU intrinsics by leveraging the uniformity of their arguments. When an intrinsic's arguments are detected as uniform, redundant computations are eliminated, and the intrinsic calls are simplified accordingly. By utilizing the UniformityInfo analysis, this pass identifies cases where intrinsic calls are uniform across all lanes, allowing transformations that reduce unnecessary operations and improve the IR's efficiency. These changes enhance performance by streamlining intrinsic usage in uniform scenarios without altering the program's semantics. For background, see PR #99878
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