8077838: Recent developments for ppc.
Summary: Power 8 recognition and instructions, math.*Exact intrinsics and rtm, C2 optimizations
Reviewed-by: kvn, simonis
/*
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// Make sure the defines don't screw up the declarations later on in this file.
#define DONT_USE_REGISTER_DEFINES
#include "asm/register.hpp"
REGISTER_DEFINITION(Register, noreg);
REGISTER_DEFINITION(FloatRegister, fnoreg);