Remove the PyFrame_FastToLocals and PyFrame_LocalsToFast calls from the trampoline call_target.
#337
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Fix #336
The trampoline function (which was copied from cpython sysmodule.c around 8 years ago) calls PyFrame_FastToLocals and PyFrame_LocalsToFast to allow python-level inspection of the frame objects. However, pyinstrument doesn't need this as the frame inspection is done in C now, and we actually would rather avoid mutating the frame object anyway.