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Rollup merge of #118198 - Zalathar:if-not, r=cjgillot 
coverage: Use `SpanMarker` to improve coverage spans for `if !` expressions

Coverage instrumentation works by extracting source code spans from MIR. However, some kinds of syntax are effectively erased during MIR building, so their spans don't necessarily exist anywhere in MIR, making them invisible to the coverage instrumentor (unless we resort to various heuristics and hacks to recover them).

This PR introduces `CoverageKind::SpanMarker`, which is a new variant of `StatementKind::Coverage`. Its sole purpose is to represent spans that would otherwise not appear in MIR, so that the coverage instrumentor can extract them.

When coverage is enabled, the MIR builder can insert these dummy statements as needed, to improve the accuracy of spans used by coverage mappings.

Fixes #115468.

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```@rustbot``` label +A-code-coverage
2023-12-09 00:48:08 -08:00
..
src Rollup merge of #118198 - Zalathar:if-not, r=cjgillot 2023-12-09 00:48:08 -08:00
Cargo.toml Clean up rustc_*/Cargo.toml. 2023-10-30 08:46:02 +11:00
messages.ftl Add a custom panic message for resuming gen blocks after they panicked 2023-10-30 10:23:57 +00:00
README.md

README.md

For more information about how rustc works, see the rustc dev guide.