Work around GCC error for inline assembly.

gc_boehm.c

@@ -506,10 +506,11 @@ void objc_clear_stack(unsigned long options)
 	// how much stack space is left somehow, but this is not possible to do
 	// portably.
 	int i[1024];
-	memset(&i, 0, 1024);
+	int *addr = &i[0];
+	memset(addr, 0, 1024);
 	// Tell the compiler that something that it doesn't know about is touching
 	// this memory, so it shouldn't optimise the allocation and memset away.
-	__asm__  volatile ("" : : "m"(i) : "memory");
+	__asm__  volatile ("" :  : "m"(addr) : "memory");
 
 }
 // FIXME: These are all stub implementations that should be replaced with