Only strip invariant.load from special pointers

[vchuravy]

Other backends (in this case NVPTX) require that invariant.load
metadata is maintained to generate non-coherent loads.

Currently, we unconditionally strip that metadata from all loads,
since our other uses of it may have become invalid.

x-ref: llvm/llvm-project#112834 JuliaGPU/CUDA.jl#2531

[vchuravy]

@nanosoldier runtests(ALL, vs = ":master", configuration = (buildflags=["LLVM_ASSERTIONS=1", "FORCE_ASSERTIONS=1"],), vs_configuration = (buildflags = ["LLVM_ASSERTIONS=1", "FORCE_ASSERTIONS=1"],))

[nanosoldier]

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