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 a2aba571a8497fe81f2bed87eadead279039af18..d5979277e1145e6c5c6ac414e56caacc71f87740 100644
--- a/src/IceInstARM32.h
+++ b/src/IceInstARM32.h
@@ -731,6 +731,7 @@ public:
       return;
     emitThreeAddrFP(Opcode, this, Func);
   }
+  void emitIAS(const Cfg *Func) const override;
   void dump(const Cfg *Func) const override {
     if (!BuildDefs::dump())
       return;