Create Unique identifier for a block
Create Unique identifier for a block

Summary:
To avoid collisions caused by using hash of method names and block ids to identify a block, we now use full de-obfuscated method name and block id as unique identifier for a basic block.
This will avoid any collisions during runtime.

Reviewed By: minjang

Differential Revision: D8814666

fbshipit-source-id: 4f079e32a21fdc179292d5c5cdc4aed9edf801a5

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