[v3] Avoid istreambuf_iterator::operator*() calls

[Paolo Carlini]

Hi,

the below, trivial, change, repairs a few places where we called
unnecessarily the relatively heavy and costly operator*().

Added to the recent improvements to basic_string, on x86 we are
now roughly 10% faster in parsing floats and monetary quantities
(slightly better on x86_64 and in the statically linked case).

Regtested x86-linux, committing to mainline.

Paolo.

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