QImageReader: remove some unneeded relocations

Replace an array of pairs of pointers with an array of pairs of
arrays. Remove the unused end marker. Add a static_assert to
verify that the size of the array matches the constant all loops
use.

Also extract the common part of the mime-type name and append it when
building a QByteArray from it. This is free, as both the new
QStringBuilder expression as well as the old construction from a const
char * incur one memory allocation each.

Replace one indexed loop with ranged-for.

Results on optimized GCC 6.1.1 Linux AMD64 builds:
 text   -96B
 data  -160B
 relocs -16

Change-Id: Ic23eb06bacbf70afb6f60e2fb8a140bdd3880aca
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

0 files changed, 0 insertions, 0 deletions