DynamoRIO / DynamoRIO/dynamorio

macOS a64: cannot guarantee client reachability w/ default 1G vm_size

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OpSys-OSX
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Description

on macOS arm64 w/ default vm_size 1G

```
bin64/drrun -debug -c api/bin/libbbcount.dylib -- ./main
```

```
30% of the time.

**This issue does not occur if you limit the vm_size to 512M.**

PR #7171 updates a64 macOS tests to use the 512M limit for now, but we may want to just change the default on a64 macOS for now.

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