[Patch] Avoid conversion to float when creating ConstantDataArray/ConstantDataVector

[Raoux, Thomas F]

Hi,

Could someone review (and possibly commit) this patch related to ConstantDataArray/ConstantDataVector? 

This addresses a bug discussed in this thread: http://lists.cs.uiuc.edu/pipermail/llvmdev/2015-January/080575.html

To avoid conversion to float and potential change of the constant I added new constructors for float types for ConstantDataArray/ConstantDataVector. 

Cheers,
Thomas
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