Commits on Feb 20, 2024

1. [WebAssembly] Add segment RETAIN flag to support private retained data …

   In WebAssembly, we have `WASM_SYMBOL_RETAIN` symbol flag to mark the
   referenced content as retained. However, the flag is not enough to
   express retained data that is not referenced by any symbol.
   This patch adds a new segment flag WASM_SEG_FLAG_RETAIN to support
   "private" linkage data that is retained by llvm.used.
   
   This kind of data that is not referenced but must be retained is usually
   used with encapsulation symbols (__start/__stop). Swift runtime uses
   this technique and depends on the fact "all metadata sections in live
   objects are retained", which was not guaranteed with `--gc-sections`
   before this patch.

   

   kateinoigakukun committed Feb 20, 2024
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