Auto merge of #50744 - nikic:mutable-noalias, r=alexcrichton
Emit noalias on &mut parameters by default This used to be disabled due to LLVM bugs in the handling of noalias information in conjunction with unwinding. However, according to #31681 all known LLVM bugs have been fixed by LLVM 6.0, so it's probably time to reenable this optimization. -Z no-mutable-noalias is left as an escape-hatch to debug problems suspected to stem from this change.
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