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740d871c3e
Summary: Changes default backend parallelism from thread::hardware_concurrency to the new llvm::heavyweight_hardware_concurrency, which for X86 Linux defaults to the number of physical cores (and will fall back to thread::hardware_concurrency otherwise). This avoid oversubscribing the physical cores using hyperthreading. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D25775 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284618 91177308-0d34-0410-b5e6-96231b3b80d8