[clang] remove redundant Procdesc.Node prefixes
[clang] remove redundant Procdesc.Node prefixes

Summary: I don't know when to stop being overly pedantic.

Reviewed By: skcho

Differential Revision: D24991679

fbshipit-source-id: 0ab196ff7

facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,facebook/infer,jvillard/infer,facebook/infer,facebook/infer,jvillard/infer,jvillard/infer,facebook/infer,facebook/infer,facebook/infer,jvillard/infer