[DAGCombiner] Use getTokenFactor in a few more cases.
[DAGCombiner] Use getTokenFactor in a few more cases.

SDNodes can only have 64k operands and for some inputs (e.g. large
number of stores), we can reach this limit when creating TokenFactor
nodes. This patch is a follow up to D56740 and updates a few more places
that potentially can create TokenFactors with too many operands.

Reviewers: efriedma, craig.topper, aemerson, RKSimon

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D59156

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@356668 91177308-0d34-0410-b5e6-96231b3b80d8

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