[llvm] [llvm] Use computeConstantRange to improve llvm.objectsize computation (PR #114673)

[David Spickett via llvm-commits]

DavidSpickett wrote:

This also caused some Fortran test suite failures on our single stage bot: https://lab.llvm.org/buildbot/#/builders/143/builds/3281

It's a single stage so the problem shouldn't be the flang binary itself but the code that it produces.

It is Fortran so probably less familiar to you, but it would be less code to sift through than all of llvm-tablegen. If you want to reproduce you'd build flang, install it (flang needs some header files that get put in the right place by the install) then compile those files from llvm-test-suite. IIRC Flang supports the `-emit-llvm` flag and maybe you can spot the issue from there.

If it doesn't reproduce on your machine I can try it on ours but I won't be able to do so until Tuesday.

https://github.com/llvm/llvm-project/pull/114673