[PATCH] Pretty print template arg enum constants (if possible)

[Will Wilson]

Hi Richard,

Here's a simple patch that improves pretty printing for templates args
specialized to enum constants. If an enum constant isn't available to
represent the value it falls back on printing the integer value.

Tested against latest trunk and includes a new test case and a updated
existing test case.

Let me know if it looks good to go...

Cheers,
Will.
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