[llvm] [MLGO] Delete InlineSizeEstimatorAnalysis (PR #167271)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> LGTM, but have you done a build with tflite and ran tests? I'm surprised there are no .ll files that needed changing.

Yeah, I did a local build and everything passed. The only thing that failed was the TFLite unit test because I also tried to delete the `ir2native` model, but I reverted that change for now.

https://github.com/llvm/llvm-project/pull/167271