Add VCMP{s,sz,d,dz} Instructions to ARM integrated assembler.

Also fixes bug in emitVFPddd.

BUG= https://bugs.chromium.org/p/nativeclient/issues/detail?id=4334
R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/1564393002 .
diff --git a/src/IceInstARM32.h b/src/IceInstARM32.h
index 719e446..6a9aa35 100644
--- a/src/IceInstARM32.h
+++ b/src/IceInstARM32.h
@@ -1362,6 +1362,7 @@
         InstARM32Vcmp(Func, Src0, Src1, Predicate);
   }
   void emit(const Cfg *Func) const override;
+  void emitIAS(const Cfg *Func) const override;
   void dump(const Cfg *Func) const override;
   static bool classof(const Inst *Inst) { return isClassof(Inst, Vcmp); }