dicthelpers: inline diff and join code
mpm suggested this change since it improves performance slightly.
Benchmarking hg perfcalculate -r .
Before:
! wall 0.141173 comb 0.140000 user 0.140000 sys 0.000000 (best of 66)
After:
! wall 0.138619 comb 0.140000 user 0.140000 sys 0.000000 (best of 69)
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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