Add path remapping with -coverage-prefix-map to coverage data #32416
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Previously the path to covered files in the __LLVM_COV / __llvm_covmap section were absolute. This made remote builds with coverage information difficult because all machines would have to have the same build root. This change uses the values for `-coverage-prefix-map` to remap files in the coverage info to relative paths. These paths work correctly with llvm-cov when it is run from the same source directory as the compilation, or from a different directory using the `-path-equivalence` argument. This is analogous to this change in clang https://reviews.llvm.org/D81122
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Previously the path to covered files in the __LLVM_COV / __llvm_covmap
section were absolute. This made remote builds with coverage information
difficult because all machines would have to have the same build root.
This change uses the values for
-coverage-prefix-mapto remap files inthe coverage info to relative paths. These paths work correctly with
llvm-cov when it is run from the same source directory as the
compilation, or from a different directory using the
-path-equivalenceargument.
This is analogous to this change in clang https://reviews.llvm.org/D81122