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LowerTypeTests: Represent the memory region size with the constant size-1.

Authored by pcc on Jan 11 2017, 1:32 PM.

Description

LowerTypeTests: Represent the memory region size with the constant size-1.

This means that we can use a shorter instruction sequence in the case where
the size is a power of two and on the boundary between two representations.

Differential Revision: https://reviews.llvm.org/D28421

llvm-svn: 291706

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