Erik Eckstein 4b462004e7 Optimizer: Fix InstructionRange's begin instruction ...

Just don't store the begin instruction.
This led to problem if the "begin" was not actually an instruction but a block argument.
Using the first instruction of that block is not correct in case the range ends immediately at the first instruction, e.g.

```
  bb0(%0 : @owned $C):
    destroy_value %0
```

2024-12-10 16:28:10 +01:00

6.6 KiB

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