llvm dev - Mar 2019 - Notice to target maintainers: Update intrinsics to use immarg

Hi,

I committed the new immarg attribute in r355981. All intrinsic definitions
should be updated to mark parameters which are required to be simple constants.
As of r356144, all of the in tree intrinsics which I’m aware of should be
accurate. At the moment this isn’t required for correctness, but will be in the
future. Once https://reviews.llvm.org/D58233 is committed, passes will be
allowed to replace intrinsic call arguments with variables if they are not
marked as immarg.

-Matt
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