Andrew Kelley 2f42a2617b CI: more stage2 test coverage
* Test everything on the Linux CI even if we can't run it, because it's
   our fastest machine.
 * Test stage2 using a build of stage2 (instead of using `-fno-stage1`)
   so that compiler-rt is also built with stage2.
 * Additionally test running x86_64-macos on the macOS CI, both the LLVM
   backend and x86_64 backend.
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