libclang: remove unneeded const_casts


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174280 91177308-0d34-0410-b5e6-96231b3b80d8
libclang: migrate USRGenerator to ConstDeclVisitor


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174281 91177308-0d34-0410-b5e6-96231b3b80d8
Constify ASTContext::getObjContainingInterface


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174282 91177308-0d34-0410-b5e6-96231b3b80d8
libclang: remove unneeded const_cast


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174283 91177308-0d34-0410-b5e6-96231b3b80d8
libclang: migrate IndexingDeclVisitor to ConstDeclVisitor


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174284 91177308-0d34-0410-b5e6-96231b3b80d8
libclang: remove 'using namespace cxstring'


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174285 91177308-0d34-0410-b5e6-96231b3b80d8
libclang: wrap CXString implementation into 'namespace cxstring'

This removes quite a few 'cxstring::' qualifications where they are obvious.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174286 91177308-0d34-0410-b5e6-96231b3b80d8