constant propagation.

llvm-svn: 46095

llvm-svn: 46092

llvm-svn: 46087

llvm-svn: 46086

that were "not a constant."

llvm-svn: 46085

Fixed some compilation errors with GREngine that showed up during
template instantiation.

llvm-svn: 46074

node caching in GREngine will guarantee that we do not insert a node twice into
a nodeset.

llvm-svn: 46071

llvm-svn: 46051

variant type, and not just the pointer value.

llvm-svn: 46049

Cleaned up GRConstants::AddBinding to not directly reference the
predecessor node.  Now we just manipulate the current state, and a driver
function creates nodes as needed.

llvm-svn: 46040

the graph reachability engine.

llvm-svn: 46036