RFR(XXS): 8166767: C2: OptimizeStringConcat produces wrong results when copying UTF16 Strings

[Doerr, Martin]

Hi,

can somebody review and sponsor this very small C2 bug fix, please?
PhaseStringOpts::copy_constant_string increments index twice in the copy loop when source and destination are UTF16 encoded.

http://cr.openjdk.java.net/~mdoerr/8166767_StringOpts_copy_bug/webrev.00/

Thanks and best regards,
Martin

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