[PATCH] Hide pragma handler classes in ParsePragma.cpp

[Reid Kleckner]

Hi rsmith,

This reduces the number of files we need to touch to add a new pragma,
and reduces the number of externally visible symbols in clang.

Make the handlers structs instead of classes because the vast majority
have no private members.

http://llvm-reviews.chandlerc.com/D2834

Files:
  include/clang/Parse/Parser.h
  lib/Parse/ParsePragma.cpp
  lib/Parse/ParsePragma.h
  lib/Parse/Parser.cpp
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