predecessor
fun predecessorBlocksForUseOf(instruction: L2Instruction, usedRegister: L2Register): List<L2BasicBlock>
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Examine the instruction and answer the predecessor L2BasicBlocks that supply a value from the specified register.
Return
A List of predecessor blocks that supplied the usedRegister as an input to this phi operation.
Parameters
instruction
The phi-instruction to examine.
used
The L2Register whose use we're trying to trace back to its definition.