* Create EVMInstructionException, properly emit did_evm_execute_instruction for insns that trap to the platform
* Emit event before execution of platform handlers. This is because many of the
platform handles actually destroy the cpu (platform.current) via pop_vm.
Clients that receive the event may want to access the cpu though, for example
to see the current PC. so we emit the event right before, so they can do this
* simplify
* move closure below result decl
* Add comment to explain
* Fix typo
* Revert back to pythonic style
It was this way to test emitting the did execute signal here, rather
than in the evm cpu
* Remove inline function definition from critical path
* Add test for events for exception instructions
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