Add VADD instruction to the ARM integrated assembler.

src/IceInstARM32.h

Index: src/IceInstARM32.h
diff --git a/src/IceInstARM32.h b/src/IceInstARM32.h
index 75f48a7ff82f70f07d356c834d8c6ed8e20e522b..46e27de4b1c4baccd7846975ca16888ecab2c045 100644
--- a/src/IceInstARM32.h
+++ b/src/IceInstARM32.h
@@ -732,6 +732,7 @@ public:
       return;
     emitThreeAddrFP(Opcode, this, Func);
   }
+  void emitIAS(const Cfg *Func) const override;
   void dump(const Cfg *Func) const override {
     if (!BuildDefs::dump())
       return;