[C++] Upstream various performance, build, and best practice fixes #3327
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Pushing upstream a bunch of performance, build, and best practice fixes.
Most of the performance fixes are related to incorrect/misused auto. Lots of places simply use
auto
which causes values to be copied. They have been switched toconst auto&
which avoids copying-by-value. The best practice fix is switching to throwRuntimeException
instead of a string literal.