Andrew Kelley 1ec50613bf CI: increase stage3 test coverage
* Use a debug build of stage3 instead of a debug build of stage2 for
   our self-hosted compiler test coverage.
 * Move coverage from stage1 to stage3 for:
   - building self-hosted without LLVM
   - building self-hosted for 32-bit arm
   - test-compiler-rt
   - test-behavior
   - test-std
   - test-compare-output
   - test-asm-link
   - test-fmt
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..
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2020-10-31 12:21:49 +02:00
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