DebugInfo: Simplify constant value emission.
This code looks to have become dead at some time in the past. I tried to
reproduce cases where LLVM would emit constants with dataN, but could
not. Upon inspection it seems the code doesn't do that anymore - the
only time a size is provided by isTypeSigned is when the type is signed,
and in those cases we use sdata. dataN is only used for unsigned types
and isTypeSigned doesn't provide a value for sizeInBits in that case.
Remove the dead cases/size plumbing.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208494
91177308-0d34-0410-b5e6-
96231b3b80d8
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