Add Om1 lowering with no optimizations

crosstest/test_icmp.cpp

Index: crosstest/test_icmp.cpp
diff --git a/crosstest/test_icmp.cpp b/crosstest/test_icmp.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f1b144d4ded29010a3c82b4efd18deb98bcf75c5
--- /dev/null
+++ b/crosstest/test_icmp.cpp
@@ -0,0 +1,21 @@
+// This aims to test the icmp bitcode instruction across all PNaCl
+// primitive integer types.
+
+#include <stdint.h>
+
+#include "test_icmp.h"
+
+#define X(cmp, op)                                                             \
+  bool icmp##cmp(uint8_t a, uint8_t b) { return a op b; }                      \
+  bool icmp##cmp(uint16_t a, uint16_t b) { return a op b; }                    \
+  bool icmp##cmp(uint32_t a, uint32_t b) { return a op b; }                    \
+  bool icmp##cmp(uint64_t a, uint64_t b) { return a op b; }
+ICMP_U_TABLE
+#undef X
+#define X(cmp, op)                                                             \
+  bool icmp##cmp(int8_t a, int8_t b) { return a op b; }                        \
+  bool icmp##cmp(int16_t a, int16_t b) { return a op b; }                      \
+  bool icmp##cmp(int32_t a, int32_t b) { return a op b; }                      \
+  bool icmp##cmp(int64_t a, int64_t b) { return a op b; }
+ICMP_S_TABLE
+#undef X