Add parse location fields to NullTest and BooleanTest structs.

We did not need a location tag on NullTest or BooleanTest before, because
no error messages referred directly to their locations.  That's planned
to change though, so add these fields in a separate housekeeping commit.

Catversion bump because stored rules may change.

src/backend/nodes/copyfuncs.c

@@ -1693,6 +1693,7 @@ _copyNullTest(const NullTest *from)
 	COPY_NODE_FIELD(arg);
 	COPY_SCALAR_FIELD(nulltesttype);
 	COPY_SCALAR_FIELD(argisrow);
+	COPY_LOCATION_FIELD(location);
 
 	return newnode;
 }
@@ -1707,6 +1708,7 @@ _copyBooleanTest(const BooleanTest *from)
 
 	COPY_NODE_FIELD(arg);
 	COPY_SCALAR_FIELD(booltesttype);
+	COPY_LOCATION_FIELD(location);
 
 	return newnode;
 }