This reverts commit bd7b44f35e.
Reland r342994: disabled the optimization and explicitly enable it in test.
-mllvm -consthoist-min-num-to-rebase<unsigned>=0
[ConstHoist] Do not rebase single (or few) dependent constant
If an instance (InsertionPoint or IP) of Base constant A has only one or few
rebased constants depending on it, do NOT rebase. One extra ADD instruction is
required to materialize each rebased constant, assuming A and the rebased have
the same materialization cost.
Differential Revision: https://reviews.llvm.org/D52243
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@343053 91177308-0d34-0410-b5e6-96231b3b80d8
Zhaoshi Zheng
c1271f6cb4