Disable Subzero IR generation for performance testing.

tests_lit/reader_tests/select.ll

 ; Tests if we can read select instructions.
 
 ; RUN: %p2i -i %s --insts | FileCheck %s
+; RUN: %if --need=allow_disable_ir_gen --command \
+; RUN:   %p2i -i %s --args -notranslate -timing -no-ir-gen \
+; RUN: | %if --need=allow_disable_ir_gen --command \
+; RUN:   FileCheck --check-prefix=NOIR %s
 
 define void @Seli1(i32 %p) {
 entry:
   %vc = trunc i32 %p to i1
   %vt = trunc i32 %p to i1
   %ve = trunc i32 %p to i1
   %r = select i1 %vc, i1 %vt, i1 %ve
   ret void
 }
 
@@ skipping 272 matching lines @@
 entry:
   %r = select <4 x i1> %pc, <4 x float> %pt, <4 x float> %pe
   ret <4 x float> %r
 }
 
 ; CHECK-NEXT: define <4 x float> @SelV4xfloatVcond(<4 x i1> %pc, <4 x float> %pt, <4 x float> %pe) {
 ; CHECK-NEXT: entry:
 ; CHECK-NEXT:   %r = select <4 x i1> %pc, <4 x float> %pt, <4 x float> %pe
 ; CHECK-NEXT:   ret <4 x float> %r
 ; CHECK-NEXT: }
+
+; NOIR: Total across all functions