[PATCH] Use ninja pool to limit the number of concurrent compile/link jobs

[Evgeniy Stepanov]

Hi chandlerc,

This change makes use of the new "job pool" capability in cmake 3.0.2 with ninja generator to allow limiting the number of concurrent jobs of a certain type.

For some reason, there is no way to define "JOB_POOLS" global property on the command line (or is there?).

We need this to limit the number of link jobs on the sanitizer-bootstrap bot, which runs out of memory linking multiple targets with debug info and sanitizer instrumentation.

http://reviews.llvm.org/D6304

Files:
  CMakeLists.txt
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