Auto merge of #54517 - mcr431:53956-panic-on-include_bytes-of-own-file, r=michaelwoer...

53956 panic on include bytes of own file

fix #53956

When using `include_bytes!` on a source file in the project, compiler would panic on subsequent compilations because `expand_include_bytes` would overwrite files in the source_map with no source. This PR changes `expand_include_bytes` to check source_map and use the already existing src, if any.

diff --cc src/librustdoc/clean/mod.rs
Simple merge

diff --cc src/libsyntax/parse/lexer/mod.rs
Simple merge

diff --cc src/libsyntax/parse/mod.rs
Simple merge

diff --cc src/test/run-pass-fulldeps/ast_stmt_expr_attr.rs
Simple merge