8182299: Enable disabled clang warnings, build on OSX 10 + Xcode 8
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
Reviewed-by: jwilhelm, ehelin, phh
Contributed-by: phh <hohensee@amazon.com>, jwilhelm <jesper.wilhelmsson@oracle.com>

8181449: Fix debug.hpp / globalDefinitions.hpp dependency inversion
Summary: Refactor debug.hpp and reverse include dependency.
Reviewed-by: coleenp, stefank, dcubed

8172098: A lot of gtests uses TEST instead of TEST_VM
Reviewed-by: iignatyev

8171517: test_logMessageTest.cpp has "ac_heapanied" instead of "accompanied" inside copyright notice
Reviewed-by: sspitsyn, jprovino

8165700: Convert LogMessage internal tests to GTest
Reviewed-by: rehn, rprotacio