Kuba (Brecka) Mracek 2d5f33e2e3 Add @_used and @_section attributes for global variables and top-level functions (#65901) ...

* Add @_used and @_section attributes for global variables and top-level functions

This adds:
- @_used attribute that flags as a global variable or a top-level function as
  "do not dead-strip" via llvm.used, roughly the equivalent of
  __attribute__((used)) in C/C++.
- @_section("...") attribute that places a global variable or a top-level
  function into a section with that name, roughly the equivalent of
  __attribute__((section("..."))) in C/C++.

2023-05-26 14:02:32 -07:00

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