Bug 1443590 is switching our official Windows builds to use clang-cl
as the compiler.
Please keep an eye out for regressions and file a blocking bug for
anything that might be fallout from this change. I'm especially
interested in hearing about the quality of the debugging experience.
It's possib
At the moment, performance is a mixed bag. Some tests are up and some
are down. In particular I believe Speedometer is down a few percent.
Note however that clang-cl is punching above its weight. These builds
currently have neither LTO nor PGO, while our MSVC builds use both of
those. Any regressi
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