[SCEV] Introduce add operation inlining limit

Inlining in getAddExpr() can cause abnormal computational time in some cases.
New parameter -scev-addops-inline-threshold is intruduced with default value 500.

Reviewers: sanjoy

Subscribers: mzolotukhin, llvm-commits

Differential Revision: https://reviews.llvm.org/D28812

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293176 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed