[llvm] [LoopDist] Add metadata for checking post process state of distribute… (PR #153902)

[Michael Kruse via llvm-commits]

================
@@ -113,6 +113,8 @@ static cl::opt<bool> EnableLoopDistribute(
     cl::desc("Enable the new, experimental LoopDistribution Pass"),
     cl::init(false));
 
+static const char *DistributedMetaData = "llvm.loop.distributed";
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Meinersbur wrote:

```suggestion
static const char *DistributedMetaData = "llvm.loop.isdistributed";
```
[bikeshedding]

https://github.com/llvm/llvm-project/pull/153902