Remove inline declaration

Remove the inline declaration from a function in spectral_norm.c since
this causes link errors when compiling with clang.
Add script to test the inline pass
Enhance inline-excercise.py

This script can now build both the pgo optimized and reference (static
optimized) versions of each benchmark and time each program.
Add some more debug output to PgoInlineAnalysis
Add function to search for optimum solution
Don't memoize results, start at 0,0