[clang][deps][cas] Fix include-tree contents with -working-directory #8367
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The first commit is llvm#84525 and will be rebased before merging.
When using -working-directory we were inconsistent about using relativeor absolute paths, which was causing failures to find files in the include-tree filesystem. Now we should be consistently using theabsolute path.
Note: this changes behaviour of things like
__FILE__
, which would normally have a relative path even with -working-directory. In the future we may want to find a way to preserve the relative paths, but that has been much harder and the current change at fixes the compilation failures.rdar://116135029