Disable Subzero IR generation for performance testing.

tests_lit/reader_tests/alloca.ll

Index: tests_lit/reader_tests/alloca.ll
diff --git a/tests_lit/reader_tests/alloca.ll b/tests_lit/reader_tests/alloca.ll
index fd1dea33e9a080b92ecac897c7744dc4002a2f60..700bfe709f0237b11b6bf128ae2d4357e8db749f 100644
--- a/tests_lit/reader_tests/alloca.ll
+++ b/tests_lit/reader_tests/alloca.ll
@@ -1,6 +1,9 @@
 ; Test if we can read alloca 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
 
 ; Show examples where size is defined by a constant.
 
@@ -159,3 +162,5 @@ entry:
 ; CHECK-NEXT:   %array = alloca i8, i32 %n, align 16
 ; CHECK-NEXT:   ret i32 %array
 }
+
+; NOIR: Total across all functions