[llvm] Add interface to check if a call has a deopt bundle (NFC) (PR #91348)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm approved this pull request.

Changing the "I.countOperandBundlesOfType" to just "getOperandBundle" is a clear improvement. Not sure how much better hiding the MD_ constant in the helper function really is 

https://github.com/llvm/llvm-project/pull/91348