Type Punning and -O3 on gcc 4.8.1 and 4.8.2

[Andy Schneider]

Sorry - that compile line is this:

g++ -std=c++0x -g  -fnon-call-exceptions -fasynchronous-unwind-tables -ffast-math -msse4 -MMD -O3 -fno-threadsafe-statics -fno-omit-frame-pointer --param inline-unit-growth=70 -Wstrict-aliasing -Wformat -
Werror=format -Wno-multichar  -Werror=sequence-point -Werror=overflow -Werror=nonnull  -Werror=return-type -Werror=unused-function -Werror=array-bounds

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