Add Om1 lowering with no optimizations

crosstest/test_arith.h

Index: crosstest/test_arith.h
diff --git a/crosstest/test_arith.h b/crosstest/test_arith.h
new file mode 100644
index 0000000000000000000000000000000000000000..996d962f5df8ae22c15749d70f6ef2c9da1c58a6
--- /dev/null
+++ b/crosstest/test_arith.h
@@ -0,0 +1,29 @@
+#include <stdint.h>
+#include "test_arith.def"
+
+#define X(inst, op, isdiv)                                                     \
+  bool test##inst(bool a, bool b);                                             \
+  uint8_t test##inst(uint8_t a, uint8_t b);                                    \
+  uint16_t test##inst(uint16_t a, uint16_t b);                                 \
+  uint32_t test##inst(uint32_t a, uint32_t b);                                 \
+  uint64_t test##inst(uint64_t a, uint64_t b);
+UINTOP_TABLE
+#undef X
+
+#define X(inst, op, isdiv)                                                     \
+  bool test##inst(bool a, bool b);                                             \
+  int8_t test##inst(int8_t a, int8_t b);                                       \
+  int16_t test##inst(int16_t a, int16_t b);                                    \
+  int32_t test##inst(int32_t a, int32_t b);                                    \
+  int64_t test##inst(int64_t a, int64_t b);
+SINTOP_TABLE
+#undef X
+
+float myFrem(float a, float b);
+double myFrem(double a, double b);
+
+#define X(inst, op, func)                                                      \
+  float test##inst(float a, float b);                                          \
+  double test##inst(double a, double b);
+FPOP_TABLE
+#undef X