[clang] Introduce paged vector (PR #66430)

[Vassil Vassilev via cfe-commits]

================
@@ -0,0 +1,267 @@
+//===- llvm/ADT/PagedVector.h - 'Lazyly allocated' vectors --------*- C++
+//-*-===//
----------------
vgvassilev wrote:

```suggestion
//===- llvm/ADT/PagedVector.h - 'Lazily allocated' vectors --*- C++ -*-===//
```

https://github.com/llvm/llvm-project/pull/66430