Fix promotion calculation

[cmoetzing]

I kept the old calculation as fallback. Removing it fails some Sun JDK6 tests.

[codecov-io]

Codecov Report

Merging #242 into develop will increase coverage by 0.05%.
The diff coverage is 76.92%.

@@              Coverage Diff              @@
##             develop     #242      +/-   ##
=============================================
+ Coverage      70.49%   70.55%   +0.05%     
- Complexity      1522     1527       +5     
=============================================
  Files            146      146              
  Lines           8632     8639       +7     
  Branches        1392     1395       +3     
=============================================
+ Hits            6085     6095      +10     
+ Misses          1963     1959       -4     
- Partials         584      585       +1

Impacted Files	Coverage Δ	Complexity Δ
...perf/gcviewer/imp/DataReaderUnifiedJvmLogging.java	80.78% <50%> (-0.28%)	67 <0> (+1)
...java/com/tagtraum/perf/gcviewer/model/GCModel.java	86.74% <81.81%> (+0.4%)	142 <0> (+4)	⬆️
...va/com/tagtraum/perf/gcviewer/view/GCDocument.java	34.93% <0%> (+0.96%)	23% <0%> (ø)	⬇️

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[cmoetzing]

Why is it that Codacy does not understand wildcard imports?