[lld] [LLD][COFF] Handle --start-lib/--end-lib group in the same way as other archives (PR #136496)

[Jacek Caban via llvm-commits]

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@@ -132,16 +139,35 @@ class ArchiveFile : public InputFile {
   llvm::DenseSet<uint64_t> seen;
 };
 
+// A synthetic -start-lib/-end-lib archive.
+class CmdLineArchive : public InputFile {
+public:
+  explicit CmdLineArchive(SymbolTable &s, MemoryBufferRef m, StringRef startLib,
+                          StringRef endLib)
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cjacek wrote:

Since the caller always passes an empty memory buffer, we might as well drop the `m` argument and hardcode it here.

https://github.com/llvm/llvm-project/pull/136496