[llvm] [IndVarSimplify] Add safety check for getTruncateExpr in genLoopLimit (PR #172234)

[Nikita Popov via llvm-commits]

nikic wrote:

Reverted this PR because it incorrectly reformatted the entire file. Please send a new PR without unrelated reformatting, and ensure that you disable any and all automated reformatting in your editor.

https://github.com/llvm/llvm-project/pull/172234