Disable Subzero IR generation for performance testing.

tests_lit/reader_tests/branch.ll

Index: tests_lit/reader_tests/branch.ll
diff --git a/tests_lit/reader_tests/branch.ll b/tests_lit/reader_tests/branch.ll
index 46b7ffa736e606519cd07793b95a701b390745d3..d3cb57d5ad3e250438ae051f835ef5240a1338ab 100644
--- a/tests_lit/reader_tests/branch.ll
+++ b/tests_lit/reader_tests/branch.ll
@@ -1,6 +1,9 @@
 ; Tests if we handle a branch instructions.
 
 ; 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 @SimpleBranch() {
 entry:
@@ -43,3 +46,5 @@ b2:
 ; CHECK-NEXT: b2:
 ; CHECK-NEXT:   br i1 %test, label %b2, label %b1
 ; CHECK-NEXT: }
+
+; NOIR: Total across all functions