Add Om1 lowering with no optimizations

tests_lit/llvm2ice_tests/fp.pnacl.ll

-; RUIN: %llvm2ice --verbose none %s | FileCheck %s
-; RUIN: %llvm2ice --verbose none %s | FileCheck --check-prefix=ERRORS %s
+; This tries to be a comprehensive test of f32 and f64 operations.
+; The CHECK lines are only checking for basic instruction patterns
+; that should be present regardless of the optimization level, so
+; there are no special OPTM1 match lines.
+
+; RUIN: %llvm2ice -O2 --verbose none %s | FileCheck %s
+; RUN: %llvm2ice -Om1 --verbose none %s | FileCheck %s
+; RUN: %llvm2ice --verbose none %s | FileCheck --check-prefix=ERRORS %s
 ; RUN: %szdiff --llvm2ice=%llvm2ice %s | FileCheck --check-prefix=DUMP %s
 
 @__init_array_start = internal constant [0 x i8] zeroinitializer, align 4
 @__fini_array_start = internal constant [0 x i8] zeroinitializer, align 4
 @__tls_template_start = internal constant [0 x i8] zeroinitializer, align 8
 @__tls_template_alignment = internal constant [4 x i8] c"\01\00\00\00", align 4
 
 define internal i32 @doubleArgs(double %a, i32 %b, double %c) {
 entry:
   ret i32 %b
@@ skipping 1077 matching lines @@
   %cond = select i1 %cmp, double %a, double %b
   ret double %cond
 }
 ; CHECK: selectDoubleVarVar:
 ; CHECK: ucomisd
 ; CHECK: ja .
 ; CHECK: fld
 
 ; ERRORS-NOT: ICE translation error
 ; DUMP-NOT: SZ