Disable Subzero IR generation for performance testing.

tests_lit/reader_tests/store.ll

 ; Test if we can read store instructions.
 
 ; RUN: %p2i -i %s --insts --no-local-syms | 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 @store_i8(i32 %addr) {
 entry:
   %addr_i8 = inttoptr i32 %addr to i8*
   store i8 3, i8* %addr_i8, align 1
   ret void
 
 ; CHECK:      __0:
 ; CHECK-NEXT:   store i8 3, i8* %__0, align 1
 ; CHECK-NEXT:   ret void
@@ skipping 112 matching lines @@
 
 define void @store_v4xFloat(i32 %addr, <4 x float> %v) {
   %addr_v4xFloat = inttoptr i32 %addr to <4 x float>*
   store <4 x float> %v, <4 x float>* %addr_v4xFloat, align 4
   ret void
 
 ; CHECK:      __0:
 ; CHECK-NEXT:   store <4 x float> %__1, <4 x float>* %__0, align 4
 ; CHECK-NEXT:   ret void
 }
+
+; NOIR: Total across all functions