Turn off LTO again for Official Win/Clang LLD builds

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 16c8a7aed472f24b9fe00642cdc71b5d95975200..65a8847e29f27048630293a1927d00a0bdc70d93 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -1490,9 +1490,8 @@ config("optimize_max") {
             # incremental value of C4702 for PGO builds is likely very small.
             "/wd4702",
           ]
-        } else if (is_clang && use_lld) {
-          cflags += [ "-flto" ]  # Link-time optimization (whole program optimization).
         }
+        # TODO(crbug.com/598772): Enable -flto for Clang.
       }
     } else if (optimize_for_fuzzing) {
       cflags = [ "-O1" ] + common_optimize_on_cflags