implement conjugate() for int, long, and float

src/runtime/float.cpp

@@ -783,6 +783,7 @@ void setupFloat() {
 
     float_cls->giveAttr("real", new (pyston_getset_cls) BoxedGetsetDescriptor(floatFloat, NULL, NULL));
     float_cls->giveAttr("imag", new (pyston_getset_cls) BoxedGetsetDescriptor(float0, NULL, NULL));
+    float_cls->giveAttr("conjugate", new BoxedFunction(boxRTFunction((void*)floatFloat, BOXED_FLOAT, 1)));
 
     float_cls->freeze();
 }

src/runtime/int.cpp

@@ -1127,6 +1127,7 @@ void setupInt() {
 
     int_cls->giveAttr("real", new (pyston_getset_cls) BoxedGetsetDescriptor(intInt, NULL, NULL));
     int_cls->giveAttr("imag", new (pyston_getset_cls) BoxedGetsetDescriptor(int0, NULL, NULL));
+    int_cls->giveAttr("conjugate", new BoxedFunction(boxRTFunction((void*)intInt, BOXED_INT, 1)));
 
     int_cls->freeze();
 }

src/runtime/long.cpp

@@ -1373,6 +1373,7 @@ void setupLong() {
 
     long_cls->giveAttr("real", new (pyston_getset_cls) BoxedGetsetDescriptor(longLong, NULL, NULL));
     long_cls->giveAttr("imag", new (pyston_getset_cls) BoxedGetsetDescriptor(long0, NULL, NULL));
+    long_cls->giveAttr("conjugate", new BoxedFunction(boxRTFunction((void*)longLong, UNKNOWN, 1)));
 
     long_cls->freeze();