Add Om1 lowering with no optimizations

tests_lit/llvm2ice_tests/store.ll

-; RUIN: %llvm2ice %s -verbose inst | FileCheck %s
-; RUIN: %llvm2ice --verbose none %s | FileCheck --check-prefix=ERRORS %s
+; Simple test of the store instruction.
+
+; RUN: %llvm2ice --verbose inst %s | FileCheck %s
+; RUN: %llvm2ice --verbose none %s | FileCheck --check-prefix=ERRORS %s
 ; RUN: %llvm2iceinsts %s | %szdiff %s | FileCheck --check-prefix=DUMP %s
 ; RUN: %llvm2iceinsts --pnacl %s | %szdiff %s \
 ; RUN:                           | FileCheck --check-prefix=DUMP %s
 
 define void @store_i64(i32 %addr_arg) {
 entry:
   %__1 = inttoptr i32 %addr_arg to i64*
   store i64 1, i64* %__1, align 1
   ret void
 
+; CHECK:       Initial CFG
 ; CHECK:       %__1 = i32 %addr_arg
 ; CHECK-NEXT:  store i64 1, {{.*}}, align 1
 ; CHECK-NEXT:  ret void
 }
 
 define void @store_i32(i32 %addr_arg) {
 entry:
   %__1 = inttoptr i32 %addr_arg to i32*
   store i32 1, i32* %__1, align 1
   ret void
 
+; CHECK:       Initial CFG
 ; CHECK:       %__1 = i32 %addr_arg
 ; CHECK-NEXT:  store i32 1, {{.*}}, align 1
 ; CHECK-NEXT:  ret void
 }
 
 define void @store_i16(i32 %addr_arg) {
 entry:
   %__1 = inttoptr i32 %addr_arg to i16*
   store i16 1, i16* %__1, align 1
   ret void
 
+; CHECK:       Initial CFG
 ; CHECK:       %__1 = i32 %addr_arg
 ; CHECK-NEXT:  store i16 1, {{.*}}, align 1
 ; CHECK-NEXT:  ret void
 }
 
 define void @store_i8(i32 %addr_arg) {
 entry:
   %__1 = inttoptr i32 %addr_arg to i8*
   store i8 1, i8* %__1, align 1
   ret void
 
+; CHECK:       Initial CFG
 ; CHECK:       %__1 = i32 %addr_arg
 ; CHECK-NEXT:  store i8 1, {{.*}}, align 1
 ; CHECK-NEXT:  ret void
 }
 
 ; ERRORS-NOT: ICE translation error
 ; DUMP-NOT: SZ