Subzero: Use -filetype instead of -ias and -elf-writer.

tests_lit/llvm2ice_tests/nop-insertion.ll

 ; This is a smoke test of nop insertion.
 
 ; REQUIRES: allow_dump
 
-; Don't use integrated-as because this currently depends on the # variant
+; Don't use filetype=iasm because this currently depends on the # variant
 ; assembler comment.
 ; RUN: %p2i -i %s -a -sz-seed=1 -nop-insertion -nop-insertion-percentage=50 \
-; RUN:    -max-nops-per-instruction=1 -integrated-as=false \
+; RUN:    -max-nops-per-instruction=1 -filetype=asm \
 ; RUN:    | FileCheck %s --check-prefix=PROB50
 ; RUN: %p2i -i %s -a -sz-seed=1 -nop-insertion -nop-insertion-percentage=90 \
-; RUN:    -max-nops-per-instruction=1 -integrated-as=false \
+; RUN:    -max-nops-per-instruction=1 -filetype=asm \
 ; RUN:    | FileCheck %s --check-prefix=PROB90
 ; RUN: %p2i -i %s -a -sz-seed=1 -nop-insertion -nop-insertion-percentage=50 \
-; RUN:    -max-nops-per-instruction=2 -integrated-as=false \
+; RUN:    -max-nops-per-instruction=2 -filetype=asm \
 ; RUN:    | FileCheck %s --check-prefix=MAXNOPS2
 
 define <4 x i32> @mul_v4i32(<4 x i32> %a, <4 x i32> %b) {
 entry:
   %res = mul <4 x i32> %a, %b
   ret <4 x i32> %res
 ; PROB50-LABEL: mul_v4i32:
 ; PROB50: nop # variant = 3
 ; PROB50: subl $60, %esp
 ; PROB50: nop # variant = 4
@@ skipping 66 matching lines @@
 ; MAXNOPS2: pshufd $216, %xmm0, %xmm0
 ; MAXNOPS2: nop # variant = 3
 ; MAXNOPS2: movups %xmm0, (%esp)
 ; MAXNOPS2: nop # variant = 0
 ; MAXNOPS2: movups (%esp), %xmm0
 ; MAXNOPS2: nop # variant = 2
 ; MAXNOPS2: addl $60, %esp
 ; MAXNOPS2: nop # variant = 4
 ; MAXNOPS2: ret
 }