[clang] [clang][bytecode] Lazily run ctor func of local blocks (PR #233250)

[Kazu Hirata via cfe-commits]

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kazutakahirata wrote:

IIUC, removing `LocalScope::forceInit()` and `this->VarScope->forceInit()` leaves `forceInit()` unused here.  Should we remove this as well?
```suggestion
```

https://github.com/llvm/llvm-project/pull/233250