parisc: prefer _THIS_IP_ and _RET_IP_ statement expressions

As part of the effort to reduce the code duplication between _THIS_IP_
and current_text_addr(), let's consolidate callers of
current_text_addr() to use _THIS_IP_.
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/kernel/unwind.c

@@ -439,8 +439,8 @@ unsigned long return_address(unsigned int level)
 	/* initialize unwind info */
 	asm volatile ("copy %%r30, %0" : "=r"(sp));
 	memset(&r, 0, sizeof(struct pt_regs));
-	r.iaoq[0] = (unsigned long) current_text_addr();
-	r.gr[2] = (unsigned long) __builtin_return_address(0);
+	r.iaoq[0] = _THIS_IP_;
+	r.gr[2] = _RET_IP_;
 	r.gr[30] = sp;
 	unwind_frame_init(&info, current, &r);