[PATCH] Improve error recovery around colon.

[Serge Pavlov]

Parse declspec with colon protection turned on.

It reduces number of cases where colon recovery is possible, but looks more reliable.

http://reviews.llvm.org/D3653

Files:
  lib/Parse/ParseDecl.cpp
  lib/Parse/ParseDeclCXX.cpp
  test/SemaCXX/enum-bitfield.cpp
  test/SemaCXX/nested-name-spec.cpp
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