Add support for nd_vars and Merge pattern matchers #91
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This changeset adds two new features -
Added basic support for nd_vars a new type for sampling and constraining non-deterministic values. The use case is for implementing backward data-flow analyses. Currently support for nd_vars has been added. bool supports a basic requires_equal function. Sample 61 has been added to test the same.
Merged support for pattern matches: A new type matcher::pattern has been introduced that allows expressing patterns with arbitrary level of abstraction. Two interfaces for matchers and replacers have been introduced. patterns support captures of named expressions and common overloads for simplifying pattern creation. Support for statement matching will be added later. Sample 62 has been added to test the same.