[clang] [flang] [llvm] [mlir] Make MMIWP not have ownership over MMI + Remove Move Constructor of MMI + Make MMI Only Use and Externally-Created MCContext (PR #105541)

[Arthur Eubanks via cfe-commits]

aeubanks wrote:

I'm just back from vacation, taking a look

looks like this has merge conflicts

could you simplify the commit title (maybe move some details into the description)

https://github.com/llvm/llvm-project/pull/105541