Add Om1 lowering with no optimizations

crosstest/test_arith.cpp

Index: crosstest/test_arith.cpp
diff --git a/crosstest/test_arith.cpp b/crosstest/test_arith.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..18b4b574d677d6caec1ad1123d1d427e0d5a0165
--- /dev/null
+++ b/crosstest/test_arith.cpp
@@ -0,0 +1,30 @@
+// This aims to test all the arithmetic bitcode instructions across
+// all PNaCl primitive data types.
+
+#include <stdint.h>
+
+#include "test_arith.h"
+
+#define X(inst, op, isdiv)                                                     \
+  bool test##inst(bool a, bool b) { return a op b; }                           \
+  uint8_t test##inst(uint8_t a, uint8_t b) { return a op b; }                  \
+  uint16_t test##inst(uint16_t a, uint16_t b) { return a op b; }               \
+  uint32_t test##inst(uint32_t a, uint32_t b) { return a op b; }               \
+  uint64_t test##inst(uint64_t a, uint64_t b) { return a op b; }
+UINTOP_TABLE
+#undef X
+
+#define X(inst, op, isdiv)                                                     \
+  bool test##inst(bool a, bool b) { return a op b; }                           \
+  int8_t test##inst(int8_t a, int8_t b) { return a op b; }                     \
+  int16_t test##inst(int16_t a, int16_t b) { return a op b; }                  \
+  int32_t test##inst(int32_t a, int32_t b) { return a op b; }                  \
+  int64_t test##inst(int64_t a, int64_t b) { return a op b; }
+SINTOP_TABLE
+#undef X
+
+#define X(inst, op, func)                                                      \
+  float test##inst(float a, float b) { return func(a op b); }                  \
+  double test##inst(double a, double b) { return func(a op b); }
+FPOP_TABLE
+#undef X