Fix String#to_i with leading zero and underscores #7934
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We're only supposed to bail out on 2 or more consecutive underscores. Probably ported wrong since us += 0 makes 0 sense. Fixes jruby#7749
Specifically for cases with leading zeros, which falls into logic in CRuby that ignores any number of non-consecutivee underscores but bails out on two or more consecutive underscores.
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Logic here is intended to bail out when the leading digit is
0and there are two or more consecutive underscores, but it appears it was ported incorrectly (us += 0馃え) resulting in it bailing out after ANY second underscore.Fixes #7749.