Updated FIR to add __shared__ optimization of Base_HIP variant. #543
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Modified RAJAPerf/src/apps/{FIR-Hip.cpp,FIR.hpp}
to use shared/LDS memory in Base_HIP variant
to reduce pressure on vL1D/L2 cache, which
resulted in a > 1.5x speedup under ROCm-6.4.0
for --size 100000000 /* 1E8 */ .