Finish replacing ThunkManager with ABI_PushRegistersAndAdjustStack.

As part of that, change SafeLoadToEAX to SafeLoadToReg, and have JitIL
use that, which should fix fastmem on JitIL.

This should also fix a potential stack corruption issue with x86.

Source/Core/Common/CMakeLists.txt

@@ -37,7 +37,6 @@ else()
 	if(NOT _M_GENERIC) #X86
 		set(SRCS	${SRCS}
 					Src/x64FPURoundMode.cpp
-					Src/x64Thunk.cpp
 					)
 	endif()
 	set(SRCS ${SRCS} Src/x64CPUDetect.cpp)