[compiler-rt] [compiler-rt] Do not assume pthread_key_t to be a scalar type. (PR #70786)

[A. Jiang via llvm-commits]

================
@@ -72,7 +72,7 @@ Error runInitArray(const std::vector<ExecutorAddrRange> &InitArraySections,
 }
 
 struct TLSInfoEntry {
-  unsigned long Key = 0;
+  pthread_key_t Key = { 0 };
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frederick-vs-ja wrote:

```suggestion
  pthread_key_t Key = {};
```

https://github.com/llvm/llvm-project/pull/70786