Add a multiplication test

Author: dylanmckay

tests/multiply.cpp

@@ -0,0 +1,18 @@
+// RUN: @cxx @cxxflags -mmcu=atmega328p @file -o @tempfile && avr-sim @tempfile
+
+#include "../src/libavrlit/avr-lit.hpp"
+
+using namespace test;
+
+template<typename T>
+T __attribute__ ((noinline)) mul(T lhs, T rhs) {
+  return lhs * rhs;
+}
+
+void run_test() {
+// CHECK: mul<uint32_t>(49, 1077) = 52773
+  eval(mul<uint32_t>(49, 1077));
+// CHECK: 439313136
+  eval(mul<uint32_t>(99123, 4432));
+}
+