[lld] [lld][WebAssembly] Implement `--start-lib`/`--end-lib` (PR #78821)

[Sam Clegg via llvm-commits]

================
@@ -94,6 +94,9 @@ class LinkerDriver {
   // True if we are in --whole-archive and --no-whole-archive.
   bool inWholeArchive = false;
 
+  // True if we are in --start-lib and --end-lib.
----------------
sbc100 wrote:

Just matching the comment above and in the ELF linker here.  I'm not sure this is a huge grammatical error.

https://github.com/llvm/llvm-project/pull/78821