Split out LLVM PGO step and use clang 13 to compile LLVM#89499

Merged

bors merged 2 commits intorust-lang:masterfrom

Mark-Simulacrum:with-llvm-13

Oct 18, 2021

Commits on Oct 14, 2021

Move LLVM profiling to a separate phase of compilation
Mark-Simulacrum
committed
Switch to clang v13 as the C/C++ compiler used for bootstrap
Mark-Simulacrum
committed