[cfe-dev] Patch to fix 2>&1 > /dev/null tests on Windows

[Baptiste Lepilleur]

This patch fixes failures of test such as:
// RUN: clang-cc -E %s -fno-caret-diagnostics 2>&1 >/dev/null | grep 'file
successfully included' | count 3

when run on Windows with the shell emulation.
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