D9770: Optimization of byteSize(double size)

[Jaime Torres Amate]

jtamate created this revision.
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REVISION SUMMARY
  Copying 20Gib, using callgrind, before it used 5,2% of the cpu, and
  after only 0,58%.
  Applying this patch, the file copy speed is the same as cp/mv but the
  cpu usage grows from 40% up to 80% spent in io-wait.

TEST PLAN
  callgrind of dolphin moving 4Gb files from ext4 to ntfs as in the 
  bug 384561

REPOSITORY
  R288 KJobWidgets

BRANCH
  performance (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D9770

AFFECTED FILES
  src/kjobtrackerformatters.cpp

To: jtamate, #frameworks
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