For method-only instrumentation, track all source blocks in entry
For method-only instrumentation, track all source blocks in entry

Summary: As title. When a method is too large to be instrumented, or does not have exit instrumentation, conservatively track all source-blocks with the entry block.

Reviewed By: minjang

Differential Revision: D33242866

fbshipit-source-id: a65e3159452cf49761fb34f0dad1b7b78441ccaf

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