[LLD][ELF] Fix stale comments about doing ICF

Differential Revision: https://reviews.llvm.org/D68396

llvm-svn: 374362

lld/ELF/Driver.cpp

@@ -1915,9 +1915,10 @@ template <class ELFT> void LinkerDriver::link(opt::InputArgList &args) {
   // Replace common symbols with regular symbols.
   replaceCommonSymbols();
 
-  // Do size optimizations: garbage collection, merging of SHF_MERGE sections
-  // and identical code folding.
+  // Split SHF_MERGE and .eh_frame sections into pieces in preparation for garbage collection.
   splitSections<ELFT>();
+
+  // Garbage collection and removal of shared symbols from unused shared objects.
   markLive<ELFT>();
   demoteSharedSymbols();