[LLVMdev] [PATCH] Allow per-thread re-direction of outs()/errs()

[Justin Holewinski]

The attached patch add the ability to programmatically re-direct outs()/errs() to an arbitrary raw_ostream instance, maintaining the raw_ostream instances in a stack structure so clients can push/pop streams at will.  The stack is also maintained in thread-local storage, so different threads can re-direct individually.  This allows for two use cases:

1. Compilers can attach custom streams to outs()/errs() to intercept output from LLVM without needing to play with STDOUT/STDERR.
2. Compilers can receive LLVM output from different threads individually, instead of having all diagnostics dumped to a single stream.

Unit tests are included in the patch.


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