[PATCH] Emit void type as unspecified type with name "void"

[Adrian Prantl]

According to section 5.2 of the DWARF4 standard, the void type
should be represented as an unspecified type with the name "void”.
(Before this we would emit an empty type and let the debugger guess the name).
    
Fix for rdar://problem/13291085

thanks,
Adrian
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