[$] Python interpreter adds tail calls

TheFaster CPython project has been working to speed up the Python interpreterfor the past several years. Now, Ken Jin, a member of the project, has merged anew set of changes thathave beenbenchmarked as improving performance by 10% for some architectures.The only change is switching from using computed goto statements to usingtail calls as part of the implementation of Python's bytecode interpreter - but that change allowsmodern compilers to generate significantly better code.