[HarfBuzz] harfbuzz: Changes to 'use-sinhala'

[Behdad Esfahbod]

New branch 'use-sinhala' available with the following commits:
commit e9002831815bad77c27145f2622fa459b81ff42b
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Mon Oct 1 12:43:12 2018 +0200

    [use] Copy Sinhala decompositions from Indic shaper

commit 371a8b78a719a987fe2a4fabbd0a74f0a04adf07
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Mon Oct 1 12:23:39 2018 +0200

    [use] Switch Sinhala to USE
    
    Breaks stuff.  Just a start.
    
    https://github.com/harfbuzz/harfbuzz/issues/1044
    https://github.com/harfbuzz/harfbuzz/issues/1182