llvm-svn: 45419

llvm-svn: 44282

This makes the parser much easier to understand, eliminates a ton of global variables,
and gives tblgen nice caret diagnostics.  It is also faster, but tblgen probably doesn't
care about performance.

There are a couple of FIXMEs which I will take care of next.

llvm-svn: 44274

llvm-svn: 44227

llvm-svn: 44226

one dependency on flex and gets rid of two ".cvs" files.

llvm-svn: 44210