[NVVM] Add various intrinsic attrs, cleanup and consolidate td (#153436)

- llvm.nvvm.reflect - Use a PureIntrinsic for (adding speculatable),
this will be replaced by a constant prior to lowering so speculation is
fine.
- llvm.nvvm.tex.* - Add [IntrNoCallback, IntrNoFree, IntrWillReturn]
- llvm.nvvm.suld.* - Add [IntrNoCallback, IntrNoFree] and
[IntrWillReturn] when not using "clamp" mode
- llvm.nvvm.sust.* - Add [IntrNoCallback, IntrNoFree, IntrWriteMem] and
[IntrWillReturn] when not using "clamp" mode
- llvm.nvvm.[suq|txq|istypep].* - Use DefaultAttrsIntrinsic
- llvm.nvvm.read.ptx.sreg.* - Add [IntrNoFree, IntrWillReturn] to
non-constant reads as well.

Author: AlexMaclean