Add Om1 lowering with no optimizations

tests_lit/llvm2ice_tests/select-opt.ll

Index: tests_lit/llvm2ice_tests/select-opt.ll
diff --git a/tests_lit/llvm2ice_tests/select-opt.ll b/tests_lit/llvm2ice_tests/select-opt.ll
index e47dd3c2b37144a3b2c605344c35a0aadb146a1a..db6fab37761696c02e53c4deb8e6be37ae0c57fb 100644
--- a/tests_lit/llvm2ice_tests/select-opt.ll
+++ b/tests_lit/llvm2ice_tests/select-opt.ll
@@ -1,5 +1,11 @@
-; RUIN: %llvm2ice %s | FileCheck %s
-; RUIN: %llvm2ice --verbose none %s | FileCheck --check-prefix=ERRORS %s
+; Simple test of the select instruction.  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
 
 define void @testSelect(i32 %a, i32 %b) {