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3f65f71833
Drive-by fix to make sure the __retarget_buffer works correctly whan
using a hint of 1. This was discovered in one of the new tests.
Drive-by fixes __retarget_buffer when initialized with size 1.
Implements parts of
- P2093R14 Formatted output
- P2539R4 Should the output of std::print to a terminal be
synchronized with the underlying stream?
Reviewed By: #libc, ldionne
Differential Revision: https://reviews.llvm.org/D150044