Summary: When using ThinLTO, the linker performs its own parallelism. This change limits the number of parallel link jobs that Ninja will issue to keep the total number of threads reasonable when linking with ThinLTO. Reviewers: hans, ruiu Subscribers: mgorny, mehdi_amini, Prazek Differential Revision: https://reviews.llvm.org/D31990 llvm-svn: 301676
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