Add -fdebug-prefix-map and follow clang's behavior for debuginfo file/dir names
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…/dir names. This is required to have reproducible builds without remapping the source code directory to a fixed location (for example in Bazel, where the source code for every build action will end up in a sandbox directory with some hash in the path name). Try to keep the implementation as close as possible to what clang does.
JohanEngelen
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https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fdebug-prefix-map
This is required to have reproducible builds without remapping the source code directory to a fixed location (for example in Bazel, where the source code for every build action will end up in a sandbox directory with some hash in the path name).
Try to keep the implementation as close as possible to what clang does.
Originally implemented by Ilya, modified and expanded by Johan.