Auto merge of #53524 - alexcrichton:buffer-out, r=eddyb

Buffer LLVM's object output stream

In some profiling on OSX I saw the `write` syscall as quite high up on
the profiling graph, which is definitely not good! It looks like we're
setting the output stream of an object file as directly to a file
descriptor which means that we run the risk of doing lots of little
writes rather than a few large writes.

This commit fixes this issue by adding a buffered stream on the output,
causing the `write` syscall to disappear from the profiles on OSX.

0 files changed, 0 insertions, 0 deletions