Partial handlling of 64-bit integer constants.

- Parse integer constants in Thrift files as 64-bit ints.
- Die if an overflow occurs.
- Warn if an enum value cannot fit in 32 bits.
- Add a simple test for the above.

I ran all of the generators over BrokenConstants.thrift before adding the
overflow, and they appeared to work.  However, the code generated was not
always valid (for example, the 64-bit constant must have an LL suffix in C++).


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@672907 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/test/BrokenConstants.thrift b/test/BrokenConstants.thrift
new file mode 100644
index 0000000..4c47b33
--- /dev/null
+++ b/test/BrokenConstants.thrift
@@ -0,0 +1,6 @@
+const i64 myint = 68719476736
+const i64 broken = 9876543210987654321  // A little over 2^63
+
+enum foo {
+  bar = 68719476736
+}