[DAGCombiner] Limit number of nodes explored as store candidates.

[DAGCombiner] Limit number of nodes explored as store candidates.

To find the candidates to merge stores we iterate over all nodes in a chain
for each store, which leads to quadratic compile times for large basic blocks
with a large number of stores.

Reviewers: niravd, spatel, craig.topper

Reviewed By: niravd

Differential Revision: https://reviews.llvm.org/D61511

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@360357 91177308-0d34-0410-b5e6-96231b3b80d8