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[circular_raw_ostream] Delegate is_displayed to contained stream

Authored by Troy A. Johnson <troyj@cray.com> on Aug 17 2019, 7:20 AM.

Description

[circular_raw_ostream] Delegate is_displayed to contained stream

raw_ostream has an is_displayed() member function that determines if the stream
is connected to a console for display or is connected to a file/pipe. By
default, is_displayed() returns false, and derived classes like raw_fd_ostream
override it. Because circular_raw_ostream wraps another stream, its result for
is_displayed() should be the same as that stream.

Differential Revision: https://reviews.llvm.org/D66026

llvm-svn: 369188