tests: Test line number in debuginfo for diverging function calls

[Enselic]

Closes #59558 which just E-needs-test.

The bug seems to have been fixed in nightly-2021-05-10:

for toolchain in nightly-2021-05-09 \
                 nightly-2021-05-10 \
                 1.88; do
    echo -e "\nWith $toolchain:"
    rustc +$toolchain tests/codegen/diverging-function-call-debuginfo.rs --emit llvm-ir -o /tmp/out.ll -g -Clto -Copt-level=0
    build/x86_64-unknown-linux-gnu/ci-llvm/bin/FileCheck --input-file /tmp/out.ll tests/codegen/diverging-function-call-debuginfo.rs --check-prefix=CHECK --dump-input-context 10 2>/dev/null && echo OK || echo FAIL
done

With nightly-2021-05-09:
FAIL

With nightly-2021-05-10:
OK

With 1.88:
OK

which gives the following list of candidate commits. Not clear which one it is exactly but it doesn't matter much since we can confirm that the test works. I have confirmed locally that with nightly-2021-05-09 we get line: 0 for the last call.

click to expand

$ git log ^881c1ac408d93bb7adaa3a51dabab9266e82eee8 ca82264ec7556a6011b9d3f1b2fd4c7cd0bc8ae2 --no-merges --oneline

f25aa57 Remove unused opt_span_warn function
ebbc949 Note why Handler::fatal is different from Sesssion::fatal
96509b4 Make Diagnostic::span_fatal unconditionally raise an error
e49f447 Remove some unnecessary uses of struct_span_fatal
955fdae Rename Parser::span_fatal_err -> Parser::span_err
4b7c8b0 Add #[track_caller] to FakeDefId::expect_real()
ba13225 Remove FakeDefId::expect_local()
020d83d Enable -W semicolon_in_expressions_from_macros in bootstrap
1b928ff Update LLVM submodule
c2b15a6 Support -C passes in NewPM
5519cbf Don't force -O1 with ThinLTO
7c4989a Drop -opt-bisect-limit=0 flag from test
db140de Explicitly register GCOV profiling pass as well
5ecbe7f Explicitly register instrprof pass
0318883 Make -Z new-llvm-pass-manager an Option
0367e24 Avoid predecessors having Drop impls

[rustbot]

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[wesleywiser]

Thanks @Enselic!

@bors r+ rollup

[bors]

📌 Commit dd48e56 has been approved by wesleywiser

It is now in the queue for this repository.