[lld] [lld] Merge GOT entries for symbols that have been ICFed (PR #131630)

[Jessica Clarke via llvm-commits]

================
@@ -138,6 +137,14 @@ class GotSection final : public SyntheticSection {
     bool isSymbolFunc;
   };
   SmallVector<AuthEntryInfo, 0> authEntries;
+
+  // Map of GOT entries keyed by section, offset, and type. The purpose is to
----------------
jrtc27 wrote:

(along with additional complexity for handling "zero"-sized symbols to ensure that section start symbols get the bounds of the whole section, rather than be 0 bytes as they would otherwise be)

https://github.com/llvm/llvm-project/pull/131630