win: Don't pass /guard:cf to lld for now

build/config/win/BUILD.gn

Index: build/config/win/BUILD.gn
diff --git a/build/config/win/BUILD.gn b/build/config/win/BUILD.gn
index a7db829cd6b1bc33b5f81917f905f40927067b5c..5e1f7fcc4d83dc25ef571b9490445f8c59c54db8 100644
--- a/build/config/win/BUILD.gn
+++ b/build/config/win/BUILD.gn
@@ -256,7 +256,8 @@ config("common_linker_setup") {
   # https://msdn.microsoft.com/en-us/library/windows/desktop/mt637065.aspx
   # /DYNAMICBASE (ASLR) is turned off in debug builds, therefore CFG can’t be
   # turned on either.
-  if (!is_debug) {
+  # TODO(thakis): Turn this on with lld once supported, https://crbug.com/693709
+  if (!is_debug && !use_lld) {
     # Turn on CFG in msvc linker, regardless of compiler used.
     ldflags += [ "/guard:cf" ]
   }