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Handling of integer literals is corrected according to the informal spec for the fixed-size integers: https://github.com/dart-lang/sdk/blob/master/docs/language/informal/int64.md This change allows unsigned 64-bit hexadecimal literals and MIN_INT64 to be used when running on the VM with --limit-ints-to-64-bits option. Change-Id: Ied7a7688768bcf4ff40ab5b499dd71622d2c3948 Reviewed-on: https://dart-review.googlesource.com/19400 Reviewed-by: Siva Annamalai <asiva@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>