Expand C++ macros in tools/generate-runtime-tests.py to increase coverage

test/mjsunit/runtime-gen/dataviewsetint8.js

Index: test/mjsunit/runtime-gen/dataviewsetint8.js
diff --git a/test/mjsunit/runtime-gen/numbertoexponential.js b/test/mjsunit/runtime-gen/dataviewsetint8.js
similarity index 54%
copy from test/mjsunit/runtime-gen/numbertoexponential.js
copy to test/mjsunit/runtime-gen/dataviewsetint8.js
index 21468b435d00f46ece3ec6502540c9b5ecdb6c3a..9990c4ba81ff379dc51f8700ae0b43e4247d44ec 100644
--- a/test/mjsunit/runtime-gen/numbertoexponential.js
+++ b/test/mjsunit/runtime-gen/dataviewsetint8.js
@@ -1,6 +1,8 @@
 // Copyright 2014 the V8 project authors. All rights reserved.
 // AUTO-GENERATED BY tools/generate-runtime-tests.py, DO NOT MODIFY
 // Flags: --allow-natives-syntax --harmony
+var _holder = new DataView(new ArrayBuffer(24));
+var _offset = 1.5;
 var _value = 1.5;
-var _f_number = 1.5;
-%NumberToExponential(_value, _f_number);
+var _is_little_endian = true;
+%DataViewSetInt8(_holder, _offset, _value, _is_little_endian);