PERFORMANCE: optimize common case in matches (PORegex)

                 Key: PIG-965
             Project: Pig
          Issue Type: Improvement
          Components: impl
            Reporter: Thejas M Nair

Some frequently seen use cases of 'matches' comparison operator have follow 
properties -
1. The rhs is a constant string . eg "c1 matches 'abc%' "
2. Regexes such that look for matching prefix , suffix etc are very common. eg 
- "abc%', "%abc", '%abc%' 

To optimize for these common cases , can be changed to -
1. Compile the pattern (rhs of matches) re-use it if the pattern string has not 
2. Use string comparisons for simple common regexes (in 2 above).

The implementation of Hive like clause uses similar optimizations.

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