parsers: when available, use a presized dictionary for the file foldmap
On a repo with over 300,000 files, this speeds up perffilefoldmap:
before: wall 0.178421 comb 0.180000 user 0.160000 sys 0.020000 (best of 55)
after: wall 0.164462 comb 0.160000 user 0.140000 sys 0.020000 (best of 59)
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<?include guids.wxi ?>
<?include defines.wxi ?>
<Fragment>
<ComponentGroup Id="contribFolder">
<ComponentRef Id="contrib" />
<ComponentRef Id="contrib.vim" />
</ComponentGroup>
</Fragment>
<Fragment>
<DirectoryRef Id="INSTALLDIR">
<Directory Id="contribdir" Name="contrib" FileSource="$(var.SourceDir)">
<Component Id="contrib" Guid="$(var.contrib.guid)" Win64='$(var.IsX64)'>
<File Name="bash_completion" KeyPath="yes" />
<File Name="hgk" />
<File Name="hgweb.fcgi" />
<File Name="hgweb.wsgi" />
<File Name="logo-droplets.svg" />
<File Name="mercurial.el" />
<File Name="tcsh_completion" />
<File Name="tcsh_completion_build.sh" />
<File Name="xml.rnc" />
<File Name="zsh_completion" />
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<Component Id="contrib.vim" Guid="$(var.contrib.vim.guid)" Win64='$(var.IsX64)'>
<File Name="hg-menu.vim" KeyPath="yes" />
<File Name="HGAnnotate.vim" />
<File Name="hgcommand.vim" />
<File Name="patchreview.txt" />
<File Name="patchreview.vim" />
<File Name="hgtest.vim" />
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</Directory>
</Directory>
</DirectoryRef>
</Fragment>
</Wix>