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Migrate 3C regression tests from %clang_cc1 to %clang.
This requires replacing `%clang_cc1 -verify` with `%clang -Xclang -verify` in the tests that use it. This is one part of the RUN command cleanup that we've wanted to do for a while in #346, and now it is blocking part of #576. This is because the single behavior difference we know of between %clang_cc1 and %clang (other than the need for `-Xclang`) is that %clang_cc1 turns off the system headers, and we want two of our tests that currently use %clang_cc1 to be able to get checked declarations from the system headers. As recently as dac3f97 (August 2020), all of the tests that used %clang_cc1 used -verify. Since then, a few tests have been added that use %clang_cc1 and not -verify. This lends support to my theory that the only reason we used %clang_cc1 was that we were unaware that -verify could be used with %clang via -Xclang, and some subsequently added tests copied the use of %clang_cc1 only because the authors didn't know any better. Thus, I believe that the risk of the migration affecting the validity of the tests (e.g., causing them to falsely pass) is low.
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