add support for reading macros.  This does all the reading (with a bunch of
fixme's, e.g. for tokens with identifiers) but does not actually install
them.  Some details with the predefines buffer needs to be sorted out first.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68828 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed