ppc64le: rustc-LLVM ERROR: failed to perform tail call elimination on a call site marked musttail

On powerpc64le-unknown-linux-gnu, I get this failure with python3 src/bootstrap/bootstrap.py --stage 1 test library/std --doc:

---- library/std/src/keyword_docs.rs - become_keyword (line 1363) stdout ----
rustc-LLVM ERROR: failed to perform tail call elimination on a call site marked musttail
Couldn't compile the test.
\ (no newline at end of output)
---- library/std/src/keyword_docs.rs - become_keyword (line 1363) stdout end ----

failures:
    library/std/src/keyword_docs.rs - become_keyword (line 1363)

test result: FAILED. 1402 passed; 1 failed; 20 ignored; 0 measured; 0 filtered out; finished in 22.99s

I found that the test failure went away when removing the become keyword from this line:

///         [inst, rest @ ..] => become TABLE[*inst as usize](rest, state),

There are other uses of become in this test which seem to have no issue. So it seems the issue can happen when become is used on a function looked up from a table, as opposed to when it is used on a direct call to a function item.

It looks like this would belong as a sub-issue under #112788 . The error appears similar to #148748, so possibly it is related?

Reproduce the failure with python3 src/bootstrap/bootstrap.py --stage 1 test library/std --doc on powerpc64le-unknown-linux-gnu. Start at library/std/src/keyword_docs.rs line 1363, compare the other become uses in that test, and investigate the rustc/LLVM musttail failure for a function obtained from a table. Done means the documentation test passes without removing the become usage.