[PECOFF] Recognize but ignore /implib and /safeseh for now.

So that the LLD won't print error message saying that it couldn't find
/implib or /safeseh files.

llvm-svn: 195276
diff --git a/lld/lib/Driver/WinLinkOptions.td b/lld/lib/Driver/WinLinkOptions.td
index f021b75..6404680 100644
--- a/lld/lib/Driver/WinLinkOptions.td
+++ b/lld/lib/Driver/WinLinkOptions.td
@@ -98,6 +98,7 @@
 def delayload : QF<"delayload">;
 def errorreport : QF<"errorreport">;
 def idlout : QF<"idlout">;
+def implib : QF<"implib">;
 def pdb : QF<"pdb">;
 def pdbaltpath : QF<"pdbaltpath">;
 def tlbid : QF<"tlbid">;
@@ -105,3 +106,4 @@
 def verbose_all : QF<"verbose">;
 
 defm wx : QB<"wx">;
+defm safeseh : QB<"safeseh">;
diff --git a/lld/unittests/DriverTests/WinLinkDriverTest.cpp b/lld/unittests/DriverTests/WinLinkDriverTest.cpp
index fa35851..f807be9 100644
--- a/lld/unittests/DriverTests/WinLinkDriverTest.cpp
+++ b/lld/unittests/DriverTests/WinLinkDriverTest.cpp
@@ -515,7 +515,8 @@
                     "/disallowlib:foo", "/delayload:user32", "/pdb:foo",
                     "/pdbaltpath:bar", "/verbose", "/verbose:icf", "/wx",
                     "/wx:no", "/tlbid:1", "/tlbout:foo", "/idlout:foo",
-                    "/ignoreidl", "a.obj", nullptr));
+                    "/ignoreidl", "/implib:foo", "/safeseh", "/safeseh:no",
+                    "a.obj", nullptr));
   EXPECT_EQ("", errorMessage());
   EXPECT_EQ(1, inputFileCount());
   EXPECT_EQ("a.obj", inputFile(0));