AMP reduce_by_key optimization changes
Added the .h and .inl for scatter and gather routines in include/bolt/btbb/detail/inner_product.inl And Benchmark code changes
Merge pull request #177 from rkskvk/develop

Added the .h and .inl for scatter and gather routines in include/bolt/bt...
Merge pull request #178 from avinashcpandey/develop

AMP reduce_by_key optimization changes
Merge branch 'develop' of https://github.com/HSA-Libraries/Bolt into new-changes
Added serial & TBB calls in OpenCL reduce.inl