Force split-dwarf off for nacl_helper_bootstrap.

src/trusted/service_runtime/linux/toolchain/BUILD.gn

Index: src/trusted/service_runtime/linux/toolchain/BUILD.gn
diff --git a/src/trusted/service_runtime/linux/toolchain/BUILD.gn b/src/trusted/service_runtime/linux/toolchain/BUILD.gn
index 75f5a76e77be48de6ff145c9903bdf1d758210b0..bbe9e531f88deae152a780839ebf737f5a0f6901 100644
--- a/src/trusted/service_runtime/linux/toolchain/BUILD.gn
+++ b/src/trusted/service_runtime/linux/toolchain/BUILD.gn
@@ -7,12 +7,14 @@ import("//build/toolchain/gcc_toolchain.gni")
 # This toolchain's sole purpose is to compile nacl_helper_bootstrap.c.
 # That requires a separate toolchain because that's the most reasonable way
 # to instantiate the standard configs in a context where use_gold=false
-# when the main build is using use_gold=true.  See ../BUILD.gn for details.
+# and use_debug_fission=false when the main build is using either
+# use_gold=true or use_debug_fission=true. See ../BUILD.gn for details.
 
 template("nacl_bootstrap_toolchain") {
   clang_toolchain(target_name) {
     toolchain_cpu = invoker.toolchain_cpu
     toolchain_os = target_os
+    use_debug_fission = false
     use_gold = false
   }
 }