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3d898f71e5
ac619010e3backfired when building the stdlib on rebranch. This time the problem is reversed: we should be interpreting an integer as unsigned where we no longer do, here:8f7af45115/SwiftCompilerSources/Sources/Optimizer/InstructionSimplification/SimplifyLoad.swift (L78). Rather than treating integers as signed by default, make `Builder.createIntegerLiteral` accept a generic `FixedWidthInteger`, and manipulate the value based on the generic type argument's signedness. This doesn't entirely define away unintentional sign extensions, but makes this mistake of humouring the parameter type less likely.