[MacPorts] #35825: llvm-3.1: add +pic variant

[MacPorts]

#35825: llvm-3.1: add +pic variant
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 Reporter:  jason-macports@…          |       Owner:  jeremyhu@…           
     Type:  enhancement               |      Status:  new                  
 Priority:  Normal                    |   Milestone:                       
Component:  ports                     |     Version:  2.1.2                
 Keywords:  pic                       |        Port:  llvm-3.1             
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Comment(by jeremyhu@…):

 r97620 for 3.0 and 3.1

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Ticket URL: <https://trac.macports.org/ticket/35825#comment:5>
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