Fix ARM emit() methods to count instructions generated.

src/IceInstARM32.h

Index: src/IceInstARM32.h
diff --git a/src/IceInstARM32.h b/src/IceInstARM32.h
index 28317d270f13cff97b6dd338fe31fe0855d48c4b..cf5448546b02819354c7fe60503edb7e3b2a899e 100644
--- a/src/IceInstARM32.h
+++ b/src/IceInstARM32.h
@@ -334,10 +334,18 @@ public:
     Vsub
   };
 
+  static constexpr size_t InstSize = sizeof(uint32_t);
+
   static const char *getWidthString(Type Ty);
   static const char *getVecWidthString(Type Ty);
   static CondARM32::Cond getOppositeCondition(CondARM32::Cond Cond);
 
+  /// Called inside derived methods emit() to communicate that multiple
+  /// instructions are being generated. Used by emitIAS() methods to
+  /// generate textual fixups for instructions that are not yet
+  /// implemented.
+  void startNextInst(const Cfg *Func) const;
+
   /// Shared emit routines for common forms of instructions.
   static void emitThreeAddrFP(const char *Opcode, const InstARM32 *Inst,
                               const Cfg *Func);