Rename 'ASTNode' -> 'ASTLocation'.

ASTLocation is a much better name for its intended purpose which to represent a "point" into the AST.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@74858 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed