[Libreoffice] [REVIEW] Speed up range name lookup from formula interpreter

[Kohei Yoshida]

Hi there,

I'd like to have the attached patch reviewed and pushed to the -3-4
branch.

It makes range name lookups by index a constant time which drastically
improves formula calculation performance especially with documents with
a larger number of named ranges.  This also improves the import
performance of binary Excel documents since the xls import filter
currently re-uses the range name storage to emulate shared formulas.

Review and sign-off appreciated.

Kohei

-- 
Kohei Yoshida, LibreOffice hacker, Calc