new altera ID dependent backward branch check

This lint check is a part of the FLOCL (FPGA Linters for OpenCL) project
out of the Synergy Lab at Virginia Tech.

FLOCL is a set of lint checks aimed at FPGA developers who write code
in OpenCL.

The altera ID dependent backward branch lint check finds ID dependent
variables and fields used within loops, and warns of their usage. Using
these variables in loops can lead to performance degradation.