Disable Subzero IR generation for performance testing.

tests_lit/reader_tests/constants.ll

Index: tests_lit/reader_tests/constants.ll
diff --git a/tests_lit/reader_tests/constants.ll b/tests_lit/reader_tests/constants.ll
index feb7dcdbe0d55f50a2b55dca615c9fe941ef9aa4..8f7652b8ea291e584537389526d61e8ec7e698f8 100644
--- a/tests_lit/reader_tests/constants.ll
+++ b/tests_lit/reader_tests/constants.ll
@@ -1,6 +1,9 @@
 ; Test handling of constants in function blocks.
 
 ; RUN: %p2i -i %s --insts | FileCheck %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 @TestIntegers() {
 entry:
@@ -152,3 +155,5 @@ entry:
   ret void
 ; CHECK-NEXT:   ret void
 }
+
+; NOIR: Total across all functions