[PATCH] D131595: [MC] Avoid calling vector<FieldInfo> members before FieldInfo is defined

[Ilya Biryukov via Phabricator via llvm-commits]

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The C++ Standard requires a complete type T when using any members of
`vector<T>`, see
https://eel.is/c++draft/vector#overview-4.

This only breaks with latest libc++ in C++20 mode and does not show up
in the common configurations.
We have an internal experimental configuration that discovered this.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D131595

Files:
  llvm/lib/MC/MCParser/MasmParser.cpp

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