Add "add immediate" instruction to the ARM integrated assembler.

src/IceAssemblerARM32.h

Index: src/IceAssemblerARM32.h
diff --git a/src/IceAssemblerARM32.h b/src/IceAssemblerARM32.h
index f3885bf6757d445484d0cbfe1e08aa739c59cef3..839b30e0dafd2a6755fff7d8f30946ca6951c9d7 100644
--- a/src/IceAssemblerARM32.h
+++ b/src/IceAssemblerARM32.h
@@ -93,12 +93,17 @@ public:
     (void)Kind;
     llvm_unreachable("Not yet implemented.");
   }
+
   void bind(Label *label);
 
+  // List of instructions implemented by integrated assembler.
+
+  void add(const Operand *OpRd, const Operand *OpRn, const Operand *OpSrc1,
+           bool SetFlags, CondARM32::Cond Cond);
+
   void bkpt(uint16_t Imm16);
 
-  void mov(RegARM32::GPRRegister Rd, const OperandARM32FlexImm &FlexImm,
-           CondARM32::Cond Cond);
+  void mov(const Operand *OpRd, const Operand *OpSrc, CondARM32::Cond Cond);
 
   void bx(RegARM32::GPRRegister Rm, CondARM32::Cond Cond = CondARM32::AL);