When processing Objective-C foreach statements, first check to see if the...

When processing Objective-C foreach statements, first check to see if the statement has a DeclStmt with a single Decl.  Afterwards, use DeclStmt::getSolitaryDecl() to access that Decl (thus avoiding an assertion being triggered).  These changes remove an unneeded use of ScopedDecl::getNextDeclarator() and DeclStmt::getDecl().

llvm-svn: 57207