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iss: Support PC accesses in register file/tensor ops involving different indexing #942

@BadGraphixD

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@BadGraphixD

When a program counter is a register in a register file/tensor and an operation (read or write) uses different dimensions (or accesses multiple registers at once), the CounterAccessResolvingPass currently fails to determine when such an operation involves the program counter or not. We may have to split these accesses into multiple nodes.

register R : Bits<2><32>
alias program counter PC : Bits<32> = R(0)
alias register R64 : Bits<64> = R

// the operation
R64 := 0x0

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