6962318: Update copyright year
Reviewed-by: xdono

6937112: String.lastIndexOf confused by unpaired trailing surrogate
Summary: Rewrite lastIndexOf for performance and correctness
Reviewed-by: sherman
Contributed-by: Reviewed by Ulf Zibis <ulf.zibis@gmx.de>

6943119: Rebrand source copyright notices
Reviewed-by: darcy, weijun

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