Disable Subzero IR generation for performance testing.

tests_lit/reader_tests/casts.ll

Index: tests_lit/reader_tests/casts.ll
diff --git a/tests_lit/reader_tests/casts.ll b/tests_lit/reader_tests/casts.ll
index 26dc8b74e77c898efd18e35939c1ca4de37c8ef5..506aec062b11df1bba7fac9f4df0e6c74937ff26 100644
--- a/tests_lit/reader_tests/casts.ll
+++ b/tests_lit/reader_tests/casts.ll
@@ -1,6 +1,9 @@
 ; Tests if we can read cast operations.
 
 ; RUN: %p2i -i %s --insts --no-local-syms | FileCheck %s
+; RUN: %p2i -i %s --args -notranslate -timing -noIRgen \
+; RUN:    | %if --need=allow_disable_ir_gen \
+; RUN:      --command FileCheck --check-prefix=NOIR %s
 
 ; TODO(kschimpf) Find way to test pointer conversions (since they in general
 ; get removed by pnacl-freeze).
@@ -532,3 +535,5 @@ define void @BitcastV16xi8(<16 x i8> %v) {
 ; CHECK-NEXT:   %__3 = bitcast <16 x i8> %__0 to <8 x i16>
 ; CHECK-NEXT:   ret void
 ; CHECK-NEXT: }
+
+; NOIR: Total across all functions