Disable threads on lld-link trunk bots to see if they hurt build time.

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 9426ef1836ab343f3dd3a69f822e502f91799a60..c6ea8839a08a379ce93460dd93ac60c1f20a1b8f 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -321,6 +321,12 @@ config("compiler") {
 
   if (is_posix && use_lld && !is_nacl) {
     ldflags += [ "-fuse-ld=lld" ]
+
+    # LLD as of 2016/12/02 seems to behave poorly with multi-threading.
+    # Disable threads on LLD trunk bots to see if they hurt build time.
+    if (llvm_force_head_revision) {
+      ldflags += [ "-Wl,-no-threads" ]
+    }
   } else if (use_gold) {
     ldflags += [ "-fuse-ld=gold" ]
     if (is_android) {