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();
diff --git a/lld/test/elf2/linkerscript.s b/lld/test/elf2/linkerscript.s
index a280ed9..4140a06 100644
--- a/lld/test/elf2/linkerscript.s
+++ b/lld/test/elf2/linkerscript.s
@@ -5,6 +5,10 @@
 # RUN: ld.lld2 -o %t2 %t.script
 # RUN: llvm-readobj %t2 > /dev/null
 
+# RUN: echo "INPUT(" %t ")" > %t.script
+# RUN: ld.lld2 -o %t2 %t.script
+# RUN: llvm-readobj %t2 > /dev/null
+
 # RUN: echo "GROUP(" %t.script2 ")" > %t.script1
 # RUN: echo "GROUP(" %t ")" > %t.script2
 # RUN: ld.lld2 -o %t2 %t.script1