ELF2: LinkerScript: Handle INPUT as a synonym for GROUP.

In our name resolution algorithm, --start-group and --end-group have
no special meaning.

llvm-svn: 249961
diff --git a/lld/ELF/LinkerScript.cpp b/lld/ELF/LinkerScript.cpp
index 34fda2d..e29c717 100644
--- a/lld/ELF/LinkerScript.cpp
+++ b/lld/ELF/LinkerScript.cpp
@@ -55,7 +55,7 @@
     StringRef Tok = next();
     if (Tok == "ENTRY") {
       readEntry();
-    } else if (Tok == "GROUP") {
+    } else if (Tok == "GROUP" || Tok == "INPUT") {
       readGroup();
     } else if (Tok == "INCLUDE") {
       readInclude();