[tablegen] Fixed few !foreach evaluation issues.
* !foreach on lists didn't evaluate operands of the RHS operator.
This made nested operators silently fail.
* A typo in the code could result in a wrong value substituted
for an operation which produced a false '!foreach requires an operator' error.
* Keep recursion over the DAG within ForeachHelper. This simplifies
things a bit as we no longer need to pass the Type around in order
to prevent recursion.
Differential Revision: https://reviews.llvm.org/D43083
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@324758 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed
