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Recommit "[SCEV] Use nw flag and symbolic iteration count to sharpen ranges of…

Authored by mkazantsev on Fri, Oct 16, 1:13 AM.

Description

Recommit "[SCEV] Use nw flag and symbolic iteration count to sharpen ranges of AddRecs"

It was reverted because of negative compile time impact. In this version,
less powerful proof methods are used (non-recursive reasoning only), and
scope limited to constant End values to avoid explision of complex proofs.

Differential Revision: https://reviews.llvm.org/D89381