tree a19a5c41a102d2d9f0b1c1a053d5467edb4a4934
parent 1991430a250d81f1bd48077137c615a9a3b70ef7
author A. Unique TensorFlower <gardener@tensorflow.org> 1598576310 -0700
committer TensorFlower Gardener <gardener@tensorflow.org> 1598576567 -0700

reduce python tracer overhead by keep reference of PyCodeObject and PyCFunctionObject, (instead of using TraceMe and generate trace string).
decouple python tracer from TraceMe, serialize to separate plane.

PiperOrigin-RevId: 328854114
Change-Id: I33422f7bc51182e90571923673a77d41d1899e77