tests: Test line number in debuginfo for diverging function calls
Closesrust-lang/rust#59558 which just [E-needs-test](https://github.com/rust-lang/rust/issues/59558#issuecomment-1322236891).
The bug seems to have been fixed in **nightly-2021-05-10**:
```sh
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.
<details>
<summary>click to expand</summary>
```
$ git log ^881c1ac408ca82264ec7 --no-merges --oneline
```
f25aa5767f Remove unused `opt_span_warn` function
ebbc949575 Note why `Handler::fatal` is different from `Sesssion::fatal`
96509b4835 Make `Diagnostic::span_fatal` unconditionally raise an error
e49f4471aa Remove some unnecessary uses of `struct_span_fatal`
955fdaea4a Rename `Parser::span_fatal_err` -> `Parser::span_err`
4b7c8b0b53 Add `#[track_caller]` to `FakeDefId::expect_real()`
ba13225ba1 Remove `FakeDefId::expect_local()`
020d83d9f5 Enable `-W semicolon_in_expressions_from_macros` in bootstrap
1b928ff8f8 Update LLVM submodule
c2b15a6b64 Support -C passes in NewPM
5519cbfe33 Don't force -O1 with ThinLTO
7c4989ab70 Drop -opt-bisect-limit=0 flag from test
db140de8f2 Explicitly register GCOV profiling pass as well
5ecbe7fcf8 Explicitly register instrprof pass
0318883cd6 Make -Z new-llvm-pass-manager an Option<bool>
0367e24f94 Avoid predecessors having Drop impls
</details>
56bf50df12