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dcd6162b7f
Since 65b13610a5226b84889b923bae884ba395ad084d, raw_string_ostream has been unbuffered by default. Based on an audit of llvm/utils/, this commit removes every call to `raw_string_ostream::flush()` and any call to `raw_string_ostream::str()` whose result is ignored or that doesn't help with clarity. I left behind a few calls to `str()`. In these cases, the underlying std::string was declared pretty far away and never used again, whereas stream recently had its last write. The code is easier to read as-is; the no-op call to `flush()` inside `str()` isn't harmful, and when https://reviews.llvm.org/D115421 lands it'll be gone anyway.