Fix assert when instantiating a default argument of a template defined in a
module.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187556 91177308-0d34-0410-b5e6-96231b3b80d8
Parse: Don't consider attributes of broken member declarators

ParseCXXClassMemberDeclaration was trying to use the result of
ActOnCXXMemberDeclarator to attach it to some late parsed attributes.

However when failures arise, we have no decl to attach to which
eventually leads us to a NULL pointer dereference.

While we are here, clean up the code a bit.

Fixes PR16765


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187557 91177308-0d34-0410-b5e6-96231b3b80d8
Remove broken and unnecessary vec3 handling from VisitShuffleVectorExpr.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187558 91177308-0d34-0410-b5e6-96231b3b80d8