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For module parsing and assembling, we will also need to know
all of the SPIR-V extensions and their instructions. This commit
updates the generator to generate those. Because there are
multiple instruction sets that each have a separate list of Opcodes,
no separate enum is generated for these opcodes. Additionally, the
previous mechanism for runtime instruction information, `Opcode`'s
`fn operands()`, has been removed in favor for
`InstructionSet.core.instructions()`.
Any mapping from operand to instruction is to be done at runtime.
Using a runtime populated hashmap should also be more efficient
than the previous mechanism using `stringToEnum`.
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