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cc7308a156
This requires output-ing a "Magic" 4-byte header. We also emit a block info block, to describe our blocks and records. The output of `llvm-bcanalyzer` would look like:
```
<BLOCKINFO_BLOCK/>
<Metadata NumWords=17 BlockCodeSize=2>
<Version op0=1/>
<Context NumWords=13 BlockCodeSize=2>
<GUID op0=2/>
<Counters op0=1 op1=2 op2=3/>
```
Instead of having `Unknown` for block and record IDs.