revlog: do not compute node location by hand in index_invalidate_added
The node is not guaranteed to be at the same location all the time (e.g:
changelog v2), so let's use the official existing API to get that value.
Differential Revision: https://phab.mercurial-scm.org/D12176
# See http://EditorConfig.org for the specification
root = true
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[*.{c,h}]
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end_of_line = lf
[*.t]
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