Ensure libraries built in stage0 have unique metadata #50789
Merged
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Issue #50786 shows a case with local rebuild where the libraries built
by stage0 had the same suffix as stage0's own, and were accidentally
loaded by that stage0 rustc when compiling
librustc_trans
.Now we set
__CARGO_DEFAULT_LIB_METADATA
to "bootstrap" during stage0,rather than the release channel like usual, so the library suffix will
always be completely distinct from the stage0 compiler.