[MacPorts] #15725: llvm: enable parallel build

[MacPorts]

#15725: llvm: enable parallel build
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 Reporter:  ryandesign at macports.org  |       Owner:  erickt at macports.org
     Type:  enhancement              |      Status:  new                
 Priority:  Normal                   |   Milestone:  Port Enhancements  
Component:  ports                    |     Version:  1.7.0              
 Keywords:                           |  
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 I recommend adding "`use_parallel_build yes`" to the llvm portfile. It
 seems to work for me and makes the build faster for those with multiple
 CPU cores (and `buildmakejobs` not set to 1 in `macports.conf`).

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Ticket URL: <http://trac.macports.org/ticket/15725>
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