pgsql: Add recursion depth protection to LIKE matching.

Add recursion depth protection to LIKE matching.

Since MatchText() recurses, it could in principle be driven to stack
overflow, although quite a long pattern would be needed.

Branch
------
REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/bb1d979612706655bd8be1ea54beadeee5bade85

Modified Files
--------------
src/backend/utils/adt/like.c | 1 +
src/backend/utils/adt/like_match.c | 3 +++
2 files changed, 4 insertions(+)

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