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a13be655a5
`lookup_debug_loc` calls `SourceMap::lookup_line`, which does a binary search over the files, and then a binary search over the lines within the found file. It then calls `SourceFile::line_begin_pos`, which redoes the binary search over the lines within the found file. This commit removes the second binary search over the lines, instead getting the line starting pos directly using the result of the first binary search over the lines. (And likewise for `get_span_loc`, in the cranelift backend.)
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.