WholeProgramDevirt: initialize WasDevirt in all constructors.

[krasin]

Summary

This is a follow up to r278389 and r278442.

lib/Transforms/IPO/WholeProgramDevirt.cpp

if (BitWidth == 1)
       Target.setAfterBit(AllocAfter);
     else
       Target.setAfterBytes(AllocAfter, (BitWidth + 7) / 8);
   }
 }
 
 VirtualCallTarget::VirtualCallTarget(Function *Fn, const TypeMemberInfo *TM)
     : Fn(Fn), TM(TM),
-      IsBigEndian(Fn->getParent()->getDataLayout().isBigEndian()) {}
+      IsBigEndian(Fn->getParent()->getDataLayout().isBigEndian()), WasDevirt(false) {}
 
 namespace {
 
 // A slot in a set of virtual tables. The TypeID identifies the set of virtual
 // tables, and the ByteOffset is the offset in bytes from the address point to
 // the virtual function pointer.
 struct VTableSlot {
   Metadata *TypeID;