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
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master

Details
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http://git.postgresql.org/pg/commitdiff/2e8cfcf4ea1140213eae56ce64a2c53182643578

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