Add workaround to allow testing of ARM integrated assembler.

src/IceInstARM32.h

 //===- subzero/src/IceInstARM32.h - ARM32 machine instructions --*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 316 matching lines @@
     Vadd,
     Vcmp,
     Vcvt,
     Vdiv,
     Vmrs,
     Vmul,
     Vsqrt,
     Vsub
   };
 
+  bool isIasSafe(InstKind Kind) const {
+    return !BuildDefs::checkIasmSafe() || isIasSafeImpl(Kind);
+  }
+
   static const char *getWidthString(Type Ty);
   static const char *getVecWidthString(Type Ty);
   static CondARM32::Cond getOppositeCondition(CondARM32::Cond Cond);
 
   /// Shared emit routines for common forms of instructions.
   static void emitThreeAddrFP(const char *Opcode, const InstARM32 *Inst,
                               const Cfg *Func);
 
   void dump(const Cfg *Func) const override;
 
   void emitIAS(const Cfg *Func) const override;
 
 protected:
   InstARM32(Cfg *Func, InstKindARM32 Kind, SizeT Maxsrcs, Variable *Dest)
       : InstTarget(Func, static_cast<InstKind>(Kind), Maxsrcs, Dest) {}
 
   static bool isClassof(const Inst *Inst, InstKindARM32 MyKind) {
     return Inst->getKind() == static_cast<InstKind>(MyKind);
   }
 
+  // Returns true if ARM instruction of Kind is in safe list for
+  // the integrated assembler.
+  bool isIasSafeImpl(InstKind Kind) const;
+
   // Generates text of assembly instruction using method emit(), and then adds
   // to the assembly buffer as a Fixup.
   void emitUsingTextFixup(const Cfg *Func) const;
 };
 
 /// A predicable ARM instruction.
 class InstARM32Pred : public InstARM32 {
   InstARM32Pred() = delete;
   InstARM32Pred(const InstARM32Pred &) = delete;
   InstARM32Pred &operator=(const InstARM32Pred &) = delete;
@@ skipping 866 matching lines @@
 // default implementations. Without this, there is the possibility of ODR
 // violations and link errors.
 
 template <> void InstARM32Ldr::emit(const Cfg *Func) const;
 template <> void InstARM32Movw::emit(const Cfg *Func) const;
 template <> void InstARM32Movt::emit(const Cfg *Func) const;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINSTARM32_H