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8182656: Make the required changes in GC code to build on OSX 10 + Xcode 8 8182657: Make the required changes in Runtime code to build on OSX 10 + Xcode 8 8182658: Make the required changes in Compiler code to build on OSX 10 + Xcode 8 Co-authored-by: Paul Hohensee <hohensee@amazon.com> Reviewed-by: jwilhelm, ehelin, phh