Add VSUB vector instruction to the integrated ARM assembler.

src/DartARM32/assembler_arm.h

Index: src/DartARM32/assembler_arm.h
diff --git a/src/DartARM32/assembler_arm.h b/src/DartARM32/assembler_arm.h
index c720bb1d2e285a0061d6955332933a2cb1769503..8c1b9011a272117c95b4e1762ca0b20d193807d1 100644
--- a/src/DartARM32/assembler_arm.h
+++ b/src/DartARM32/assembler_arm.h
@@ -682,10 +682,10 @@ class Assembler : public ValueObject {
   void vsubs(SRegister sd, SRegister sn, SRegister sm, Condition cond = AL);
   // Moved to Arm32::AssemblerARM32::vsubd()
   void vsubd(DRegister dd, DRegister dn, DRegister dm, Condition cond = AL);
-#endif
+  // Moved to ARM32::AssemblerARM32::vsubqi().
   void vsubqi(OperandSize sz, QRegister qd, QRegister qn, QRegister qm);
+  // Moved to ARM32::AssemblerARM32::vsubqf().
   void vsubqs(QRegister qd, QRegister qn, QRegister qm);
-#if 0
   // Moved to Arm32::AssemblerARM32::vmuls()
   void vmuls(SRegister sd, SRegister sn, SRegister sm, Condition cond = AL);
   // Moved to Arm32::AssemblerARM32::vmuld()