llvm dev - Feb 2011 - [LLVMdev] [PATCH] sys::fs::can_read() and sys::fs::can_write() for Unix

Hi - the attached patch provides implementations and tests for
sys::fs::can_read() and sys::fs::can_write() for Unix. These were adapted from
the previous implementations in lib/Support/Unix/Path.inc. can_execute() could
be implemented quite similarly, but I wasn't sure where the best place to
add a test for it would be, so left it out for now.

Thanks,
Liam

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