Make ARM RegNames[] static like X86 (no ARM syms in X86-only build).

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.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 330 matching lines @@
   }
 }
 
 bool TargetARM32::doBranchOpt(Inst *I, const CfgNode *NextNode) {
   if (InstARM32Br *Br = llvm::dyn_cast<InstARM32Br>(I)) {
     return Br->optimizeBranch(NextNode);
   }
   return false;
 }
 
-IceString TargetARM32::RegNames[] = {
-#define X(val, encode, name, scratch, preserved, stackptr, frameptr, isInt,    \
-          isFP)                                                                \
-  name,
-    REGARM32_TABLE
-#undef X
-};
-
 IceString TargetARM32::getRegName(SizeT RegNum, Type Ty) const {
   assert(RegNum < RegARM32::Reg_NUM);
   (void)Ty;
+  static const char *RegNames[] = {
+#define X(val, encode, name, scratch, preserved, stackptr, frameptr, isInt,    \
+          isFP)                                                                \
+  name,
+      REGARM32_TABLE
+#undef X
+  };
+
   return RegNames[RegNum];
 }
 
 Variable *TargetARM32::getPhysicalRegister(SizeT RegNum, Type Ty) {
   if (Ty == IceType_void)
     Ty = IceType_i32;
   if (PhysicalRegisters[Ty].empty())
     PhysicalRegisters[Ty].resize(RegARM32::Reg_NUM);
   assert(RegNum < PhysicalRegisters[Ty].size());
   Variable *Reg = PhysicalRegisters[Ty][RegNum];
@@ skipping 2392 matching lines @@
       << ".eabi_attribute 68, 1   @ Tag_Virtualization_use\n";
   if (CPUFeatures.hasFeature(TargetARM32Features::HWDivArm)) {
     Str << ".eabi_attribute 44, 2   @ Tag_DIV_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