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Here's the code:
 def replace_paths_in_code(self, co):
 ...
 return types.CodeType(co.co_argcount, co.co_nlocals, co.co_stacksize,
 co.co_flags, co.co_code, tuple(consts), co.co_names,
 co.co_varnames, new_filename, co.co_name,
 co.co_firstlineno, co.co_lnotab,
 co.co_freevars, co.co_cellvars)
Compare this to the code_new() C API doc string (and code):
code(argcount, kwonlyargcount, nlocals, stacksize, flags, codestring,\n\
 constants, names, varnames, filename, name, firstlineno,\n\
 lnotab[, freevars[, cellvars]])
The kwonlyargcount is missing in the call used in .replace_paths_in_code().
The bug surfaces when trying to use the "-r" option of the freeze.py tool:
Traceback (most recent call last):
 File "freeze.py", line 504, in <module>
 main()
 File "freeze.py", line 357, in main
 mf.import_hook(mod)
 File "/home/lemburg/egenix/projects/PyRun/tmp-3.4-ucs2/lib/python3.4/modulefinder.py", line 123, in import_hook
 q, tail = self.find_head_package(parent, name)
 File "/home/lemburg/egenix/projects/PyRun/tmp-3.4-ucs2/lib/python3.4/modulefinder.py", line 179, in find_head_package
 q = self.import_module(head, qname, parent)
 File "/home/lemburg/egenix/projects/PyRun/tmp-3.4-ucs2/lib/python3.4/modulefinder.py", line 272, in import_module
 m = self.load_module(fqname, fp, pathname, stuff)
 File "/home/lemburg/egenix/projects/PyRun/tmp-3.4-ucs2/lib/python3.4/modulefinder.py", line 303, in load_module
 co = self.replace_paths_in_code(co)
 File "/home/lemburg/egenix/projects/PyRun/tmp-3.4-ucs2/lib/python3.4/modulefinder.py", line 569, in replace_paths_in_code
 consts[i] = self.replace_paths_in_code(consts[i])
 File "/home/lemburg/egenix/projects/PyRun/tmp-3.4-ucs2/lib/python3.4/modulefinder.py", line 575, in replace_paths_in_code
 co.co_freevars, co.co_cellvars)
TypeError: an integer is required (got type bytes)

The fix is easy. Simply change the call to:
 return types.CodeType(co.co_argcount, co.co_kwonlyargcount,
 co.co_nlocals, co.co_stacksize,
 co.co_flags, co.co_code, tuple(consts),
 co.co_names, co.co_varnames,
 new_filename, co.co_name,
 co.co_firstlineno, co.co_lnotab,
 co.co_freevars, co.co_cellvars)
(ie. add the missing argument)

Here's a patch with a test.

New changeset 59921d2f023c by Berker Peksag in branch '3.4':
Issue #21707: Add missing kwonlyargcount argument to ModuleFinder.replace_paths_in_code().
http://hg.python.org/cpython/rev/59921d2f023c
New changeset 4b6798e74dcf by Berker Peksag in branch 'default':
Issue #21707: Merge with 3.4.
http://hg.python.org/cpython/rev/4b6798e74dcf 

New changeset f8deaac44ed4 by Berker Peksag in branch '3.4':
Issue #21707: Fix tests on Windows.
http://hg.python.org/cpython/rev/f8deaac44ed4
New changeset e66c387da81b by Berker Peksag in branch 'default':
Issue #21707: Merge with 3.4.
http://hg.python.org/cpython/rev/e66c387da81b