* armemu.h (WRITEDESTB): New macro.

* armemu.c (ARMul_Emulate26, bl): Use WriteR15Branch() to
modify PC.  Moved the existing logic...
(WriteR15Branch): ... here.  New function.
(WriteR15, WriteSR15): Drop the two least significant bits.
(LoadSMult): Use WriteR15Branch() to modify PC.
(LoadMult): Use WRITEDESTB() instead of WRITEDEST().

sim/arm/armemu.h

@@ -332,6 +332,11 @@ extern ARMword isize;
                          ARMul_NegZero(state, d) ; \
                          }
 
+#define WRITEDESTB(d) if (DESTReg == 15) \
+                        WriteR15Branch(state, d) ; \
+                     else \
+                          DEST = d
+
 #define BYTETOBUS(data) ((data & 0xff) | \
                         ((data & 0xff) << 8) | \
                         ((data & 0xff) << 16) | \