Fix a bug that would cause subzero to fail when --threads=0.

src/IceTargetLoweringARM32.cpp

 //===- subzero/src/IceTargetLoweringARM32.cpp - ARM32 lowering ------------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the TargetLoweringARM32 class, which consists almost
@@ skipping 2189 matching lines @@
   UnimplementedError(Ctx->getFlags());
 }
 
 void TargetARM32::emit(const ConstantUndef *) const {
   llvm::report_fatal_error("undef value encountered by emitter.");
 }
 
 TargetDataARM32::TargetDataARM32(GlobalContext *Ctx)
     : TargetDataLowering(Ctx) {}
 
-void TargetDataARM32::lowerGlobals(
-    std::unique_ptr<VariableDeclarationList> Vars) {
+void TargetDataARM32::lowerGlobals(const VariableDeclarationList &Vars,
+                                   const IceString &SectionSuffix) {
   switch (Ctx->getFlags().getOutFileType()) {
   case FT_Elf: {
     ELFObjectWriter *Writer = Ctx->getObjectWriter();
-    Writer->writeDataSection(*Vars, llvm::ELF::R_ARM_ABS32);
+    Writer->writeDataSection(Vars, llvm::ELF::R_ARM_ABS32, SectionSuffix);
   } break;
   case FT_Asm:
   case FT_Iasm: {
     const IceString &TranslateOnly = Ctx->getFlags().getTranslateOnly();
     OstreamLocker L(Ctx);
-    for (const VariableDeclaration *Var : *Vars) {
+    for (const VariableDeclaration *Var : Vars) {
       if (GlobalContext::matchSymbolName(Var->getName(), TranslateOnly)) {
-        emitGlobal(*Var);
+        emitGlobal(*Var, SectionSuffix);
       }
     }
   } break;
   }
 }
 
-void TargetDataARM32::lowerConstants() {
+void TargetDataARM32::lowerConstants(const IceString &) {
   if (Ctx->getFlags().getDisableTranslation())
     return;
   UnimplementedError(Ctx->getFlags());
 }
 
 TargetHeaderARM32::TargetHeaderARM32(GlobalContext *Ctx)
     : TargetHeaderLowering(Ctx) {}
 
 void TargetHeaderARM32::lower() {
   OstreamLocker L(Ctx);
@@ skipping 25 matching lines @@
       << ".eabi_attribute 36, 1   @ Tag_FP_HP_extension\n"
       << ".eabi_attribute 38, 1   @ Tag_ABI_FP_16bit_format\n"
       << ".eabi_attribute 42, 1   @ Tag_MPextension_use\n"
       << ".eabi_attribute 68, 1   @ Tag_Virtualization_use\n";
   // Technically R9 is used for TLS with Sandboxing, and we reserve it.
   // However, for compatibility with current NaCl LLVM, don't claim that.
   Str << ".eabi_attribute 14, 3   @ Tag_ABI_PCS_R9_use: Not used\n";
 }
 
 } // end of namespace Ice