[Patch] Speed-up money_put::do_put

[Paolo Carlini]

Hi,

the below reorganizes the formatting of the value component and
uses reserve for it: the final code is not less clear, shorter
and faster. For yesterday's testcase, same setup:

current
-------
6.350u 0.000s 0:06.52 97.3%     0+0k 0+0io 253pf+0w

current + patch
---------------
4.560u 0.000s 0:04.71 96.8%     0+0k 0+0io 255pf+0w


Regtested x86-linux.

Paolo.

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