Track undefined sym in the symtab. Remove hack for missing relocs against undef.

src/IceELFSection.cpp

 //===- subzero/src/IceELFSection.cpp - Representation of ELF sections -----===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines how ELF sections are represented.
@@ skipping 56 matching lines @@
 
 void ELFRelocationSection::addRelocations(RelocOffsetT BaseOff,
                                           const FixupRefList &FixupRefs) {
   for (const AssemblerFixup *FR : FixupRefs) {
     Fixups.push_back(*FR);
     AssemblerFixup &F = Fixups.back();
     F.set_position(BaseOff + F.position());
   }
 }
 
-size_t ELFRelocationSection::getSectionDataSize(
-    const GlobalContext &Ctx, const ELFSymbolTableSection *SymTab) const {
-  size_t NumWriteableRelocs = 0;
-  for (const AssemblerFixup &Fixup : Fixups) {
-    const ELFSym *Symbol = SymTab->findSymbol(Fixup.symbol(&Ctx));
-    // TODO(jvoung): When the symbol table finally tracks everything,
-    // just use the Fixups.size() as the count, and remove the
-    // SymTab and Ctx params.
-    if (Symbol)
-      ++NumWriteableRelocs;
-  }
-  return NumWriteableRelocs * Header.sh_entsize;
+size_t ELFRelocationSection::getSectionDataSize() const {
+  return Fixups.size() * Header.sh_entsize;
 }
 
 // Symbol tables.
 
 void ELFSymbolTableSection::createDefinedSym(const IceString &Name,
                                              uint8_t Type, uint8_t Binding,
                                              ELFSection *Section,
                                              RelocOffsetT Offset, SizeT Size) {
   ELFSym NewSymbol = ELFSym();
   NewSymbol.Sym.setBindingAndType(Binding, Type);
@@ skipping 113 matching lines @@
       continue;
     }
     StringIndex.second = StringData.size();
     std::copy(Cur.begin(), Cur.end(), back_inserter(StringData));
     StringData.push_back(0);
     Prev = Cur;
   }
 }
 
 } // end of namespace Ice