Add constness for NestedNameSpecifier::Create parameter


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173274 91177308-0d34-0410-b5e6-96231b3b80d8
Use 'const Decl *' throughout code completion in Sema


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173277 91177308-0d34-0410-b5e6-96231b3b80d8
libclang: change return type of getCursorDecl() to 'const Decl *'


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173278 91177308-0d34-0410-b5e6-96231b3b80d8