[SCEV] Suppress hoisting insertion point of binops when unsafe
InsertBinop tries to move insertion-points out of loops for expressions
that are loop-invariant. This patch adds a new parameter, IsSafeToHost,
to guard that hoisting. This allows callers to suppress that hoisting
for unsafe situations, such as divisions that may have a zero
denominator.
This fixes PR38697.
Differential Revision: https://reviews.llvm.org/D55232
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@360280
91177308-0d34-0410-b5e6-
96231b3b80d8
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