[MatMul] Make MatMul detection independent of internal isl representations.

The pattern recognition for MatMul is restrictive.

The number of "disjuncts" in the isl_map containing constraint
information was previously required to be 1
(as per isl_*_coalesce - which should ideally produce a domain map with
a single disjunct, but does not under some circumstances).

This was changed and made more flexible.

Contributed-by: Annanay Agarwal <cs14btech11001@iith.ac.in>

Differential Revision: https://reviews.llvm.org/D36460

llvm-svn: 311302