[NFC][AlwaysInliner] Reduce AlwaysInliner memory consumption. (#96958) Refactored AlwaysInliner to remove some of inlined functions earlier. Before the change AlwaysInliner walked through all functions in the module and inlined them into calls where it is appropriate. Removing of the dead inlined functions was performed only after all of inlining. For the test case from the issue [59126](https://github.com/llvm/llvm-project/issues/59126) compiler consumes all of the memory on 64GB machine, so is killed. The change checks if just inlined function can be removed from the module and removes it.
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