Jon Chesterfield 919fdbb92a [TableGen] Use less stack in DAGISelMatcherOpt
Refactor a helper function, FactorNodes, to search for a push node in constant space. This resolves a problem in a not-yet-upstreamed backend where a recursive pattern blew the call stack (at a depth of 255) under a debug build of tablegen. No functional change so no new test coverage. The change is minimal to avoid disturbing existing behaviour.

Differential Revision: https://reviews.llvm.org/D29080


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294230 91177308-0d34-0410-b5e6-96231b3b80d8
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