[v3] Minor tweaks to the facets and a speed-up

[Paolo Carlini]

Hi,

this started as a very minor clean-up, but in the process I noticed that
we weren't calling reserve on the groupings string! So, for the money_get
test used during the last days:

string
======
current head - 4.770u 0.000s 0:04.92 96.9%     0+0k 0+0io 254pf+0w
patched head - 4.010u 0.010s 0:04.12 97.5%     0+0k 0+0io 255pf+0w
current 3.4  - 8.660u 0.000s 0:08.96 96.6%     0+0k 0+0io 253pf+0w

long double
===========
current head - 4.750u 0.020s 0:04.90 97.3%     0+0k 0+0io 262pf+0w
patched head - 4.140u 0.010s 0:04.26 97.4%     0+0k 0+0io 263pf+0w
current 3.4  - 9.400u 0.010s 0:09.67 97.3%     0+0k 0+0io 261pf+0w


Regtested x86-linux.

Paolo.

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