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Most clients only used these methods because they wanted to be able to extend or truncate to the same bit width (which is a no-op). Now that the standard zext, sext and trunc allow this, there is no reason to use the OrSelf versions. The OrSelf versions additionally have the strange behaviour of allowing extending to a *smaller* width, or truncating to a *larger* width, which are also treated as no-ops. A small amount of client code relied on this (ConstantRange::castOp and MicrosoftCXXNameMangler::mangleNumber) and needed rewriting. Differential Revision: https://reviews.llvm.org/D125557
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