lit: execfile() isn't present in Python 3.3
lit: execfile() isn't present in Python 3.3

On the other hand, exec(compile()) doesn't work in older Python versions in the
2.x series.

This commit introduces exec(compile()) with a fallback to plain exec(). That'll
hopefully hit the sweet spot in terms of version support.

Followup to r198766 which added enhanced source locations for lit cfg parsing.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@199006 91177308-0d34-0410-b5e6-96231b3b80d8

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