[vm/compiler] Unify methods for UnboxIntegerOpInstr subclasses. Unify the Canonicalize() methods on subclasses of UnboxIntegerOp so that there aren't subtle differences between canonicalizing UnboxInt32 and UnboxUint32 instructions. Also unify the ComputeCanDeoptimize() methods for similar reasons. If canonicalizing a truncating unbox of a constant, then create an unboxed constant of the truncated value instead of an unboxed constant of the original untruncated value. Previously, a subclass of Definition that didn't override InferRange got a default range solely based on its type. Now, if the representation of the definition is an unboxed integer, the default range is the intersection of the range inferred from its type with the range inferred from its representation. TEST=ci Change-Id: Ib022c366904ee6f8a81995bd4c16b87bd876176d Cq-Include-Trybots: luci.dart.try:vm-aot-linux-debug-simarm_x64-try,vm-aot-linux-release-x64-try,vm-aot-linux-debug-x64-try,vm-aot-linux-debug-x64c-try,vm-win-release-x64-try,vm-ffi-qemu-linux-release-arm-try,vm-ffi-android-debug-arm-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/332400 Reviewed-by: Slava Egorov <vegorov@google.com>
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