The QTest::qCompare() implementations were almost duplicates; pull the
common code out into a templated version. Tweaked the
QTest::toString() specialization for float and double (a macro) and
fixed a bous modifier in double's format.
The doubleComparisons and floatComparisons tests in the tst_float.cpp
selftest shared a large block of tests in common, aside from the
difference of type. Break this out into a templated static function
to save duplication.
This prepares the way for using the same templated code for qfloat16.
Change-Id: I2823fd006910c5ff88335d625d1fa05cb7753513
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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