This revision adds std.inline_asm which is a counterpart to llvm.inline_asm that operates on MLIR types.
This allows connecting MLIR to actual assembly.
Arguably this should not be another addition to standard.
The discussion on splitting standard is ongoing.
If people see a new dialect I should add this to I'd be happy to just create it if it helps distribute the burden: please make a suggestion if you want this op in a different dialect than std.