Move the JIT registration logic in its own file

Move the JITed function/basic-block registration logic out of the CPU
subsystem in order to add JIT registration to JITed DSP and
Video/VertexLoader code.

This necessary in order to add /tmp/perf-$pid.map support to other
JITed code as they need to write to the same file.

Source/Core/Common/CMakeLists.txt

@@ -6,6 +6,7 @@ set(SRCS BreakPoints.cpp
          GekkoDisassembler.cpp
          Hash.cpp
          IniFile.cpp
+         JitRegister.cpp
          MathUtil.cpp
          MemArena.cpp
          MemoryUtil.cpp