ensure that every error return sets a message (and goes through Error, for

easy breakpointing).

Fix bugs reading constantexpr geps.  We now can disassemble kc++ global
initializers.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36398 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Bitcode/Reader/BitcodeReader.h

@@ -58,6 +58,7 @@ class BitcodeReader : public ModuleProvider {
   BitcodeReaderValueList ValueList;
   std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
 public:
+  BitcodeReader() : ErrorString(0) {}
   virtual ~BitcodeReader() {}
   
   virtual void FreeState() {}