Add the RSC instruction to the ARM integrated assembler.

src/DartARM32/assembler_arm.cc

Index: src/DartARM32/assembler_arm.cc
diff --git a/src/DartARM32/assembler_arm.cc b/src/DartARM32/assembler_arm.cc
index 1c1943973947f08dd38e5804ba9dfdb48b2c239f..e7295e7ea557afa4a62c3a7eb1787535af133c2a 100644
--- a/src/DartARM32/assembler_arm.cc
+++ b/src/DartARM32/assembler_arm.cc
@@ -248,12 +248,12 @@ void Assembler::sbcs(Register rd, Register rn, Operand o, Condition cond) {
   EmitType01(cond, o.type(), SBC, 1, rn, rd, o);
 }
 
-
+#if 0
+// Moved to ARM32::AssemblerARM32::rsc()f
 void Assembler::rsc(Register rd, Register rn, Operand o, Condition cond) {
   EmitType01(cond, o.type(), RSC, 0, rn, rd, o);
 }
 
-#if 0
 // Moved to ARM32::AssemblerARM32::tst()
 void Assembler::tst(Register rn, Operand o, Condition cond) {
   EmitType01(cond, o.type(), TST, 1, rn, R0, o);