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an earlier load could be widened to encompass a later load. For example, if we see: X = load i8* P, align 4 Y = load i8* (P+3), align 1 and we have a 32-bit native integer type, we can widen the former load to i32 which then makes the second load redundant. GVN can't actually do anything with this load/load relation yet, so this isn't testable, but it is the next step to resolving PR6627, and a fairly general class of "merge neighboring loads" missed optimizations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130250 91177308-0d34-0410-b5e6-96231b3b80d8
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