[clang] [clang][CodeGen] Compute the pointer-overflow offset from the index list (PR #225139)

[Mikael Holmen via cfe-commits]

mikaelholmen wrote:

Just out of curiosity, what actually happened when commiting this PR?
It looks like it was submitted twice, first in 1492dbc617, but then also in 0b04288569? THose commits have identical commit messages, but only the first one contains the actual changes, the other one is empty.

https://github.com/llvm/llvm-project/pull/225139