Disable Subzero IR generation for performance testing.

tests_lit/reader_tests/forwardref.ll

Index: tests_lit/reader_tests/forwardref.ll
diff --git a/tests_lit/reader_tests/forwardref.ll b/tests_lit/reader_tests/forwardref.ll
index b938b6c38ed8328230f731efbfb822f4548aa118..b02fcdce4fda9671a6c26abb7249eb0be0f18d00 100644
--- a/tests_lit/reader_tests/forwardref.ll
+++ b/tests_lit/reader_tests/forwardref.ll
@@ -1,9 +1,11 @@
 ; Test use forward type references in function blocks.
 
 ; RUN: %p2i -i %s --insts | FileCheck %s
-
 ; RUN: llvm-as < %s | pnacl-freeze | pnacl-bcdis -no-records \
 ; RUN:              | FileCheck --check-prefix=DUMP %s
+; RUN: %p2i -i %s --args -notranslate -timing -noIRgen \
+; RUN:    | %if --need=allow_disable_ir_gen \
+; RUN:      --command FileCheck --check-prefix=NOIR %s
 
 define void @LoopCarriedDep() {
 b0:
@@ -116,3 +118,5 @@ b6:
 ; DUMP-NEXT:   %b6:
 ; DUMP-NEXT:     ret void; <@a3>
 ; DUMP-NEXT:   }
+
+; NOIR: Total across all functions