[llvm] [LangRef] asm clobber constrains: '~memory' allows reads and synchronization (PR #150191)

[Bill Wendling via llvm-commits]

bwendling wrote:

> CC @bwendling ; he's been looking at inline asm stuff recently.
> 
> If nobody else looks, I can try to find some time to look at the SelectionDAG code... poke me in a couple weeks.

I'm on vacation ATM, but can look into it on the train back home. My change (https://github.com/llvm/llvm-project/pull/181973) luckily doesn't touch SelectionDAG anymore. :-)

https://github.com/llvm/llvm-project/pull/150191