Fix the g++ build.

src/IceELFObjectWriter.cpp

 //===- subzero/src/IceELFObjectWriter.cpp - ELF object file writer --------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 312 matching lines @@
   for (VariableDeclaration *Var : Vars) {
     Elf64_Xword Align = Var->getAlignment();
     ShAddralign = std::max(ShAddralign, Align);
   }
   constexpr Elf64_Xword ShEntsize = 0; // non-uniform data element size.
   // Lift this out, so it can be re-used if we do fdata-sections?
   switch (ST) {
   case ROData: {
     const IceString SectionName =
         MangleSectionName(IsPIC ? ".data.rel.ro" : ".rodata", SectionSuffix);
-    const Elf64_Xword ShFlags = SHF_ALLOC | (IsPIC ? SHF_WRITE : 0);
+    const Elf64_Xword ShFlags = IsPIC ? (SHF_ALLOC | SHF_WRITE) : SHF_ALLOC;
     Section = createSection<ELFDataSection>(SectionName, SHT_PROGBITS, ShFlags,
                                             ShAddralign, ShEntsize);
     Section->setFileOffset(alignFileOffset(ShAddralign));
     RODataSections.push_back(Section);
     RelSection = createRelocationSection(Section);
     RelRODataSections.push_back(RelSection);
     break;
   }
   case Data: {
     const IceString SectionName = MangleSectionName(".data", SectionSuffix);
@@ skipping 328 matching lines @@
   if (ELF64) {
     writeELFHeaderInternal<true>(ShOffset, ShStrTab->getNumber(),
                                  AllSections.size());
   } else {
     writeELFHeaderInternal<false>(ShOffset, ShStrTab->getNumber(),
                                   AllSections.size());
   }
 }
 
 } // end of namespace Ice