[cfe-commits] PATCH: Restrict isysroot to only apply to system header search paths beginning with '/'

[Chandler Carruth]

The idea is that it isn't particularly useful to try to place relative paths
within a sysroot. I can't find any particular pattern in how GCC deals with
this, so it seems extremely unlikely to break anyone currently using
'-isysroot'. The only way for this to make a difference is if using
C_INCLUDE_DIRS or CXX_INCLUDE_* macros to provide relative paths.
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