Fixes PR8611.
Silence warning about -g not being used during linking. I couldn't find any
change in behavior in gcc liking when given -g. Please open another bug if
I missed something.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@119166 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 223576e..31def8f 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -3207,6 +3207,9 @@
   const Driver &D = ToolChain.getDriver();
   ArgStringList CmdArgs;
 
+  // Silence warning for "clang -g foo.o -o foo"
+  Args.ClaimAllArgs(options::OPT_g_Group);
+
   if (Arg *A = Args.getLastArg(options::OPT__sysroot_EQ)) {
     CmdArgs.push_back("--sysroot");
     CmdArgs.push_back(A->getValue(Args));