another 4.8.1 hack; make more specific and add more info

doc/HACKS

@@ -1,4 +1,4 @@
-# $NetBSD: HACKS,v 1.137 2013/11/07 21:33:59 christos Exp $
+# $NetBSD: HACKS,v 1.138 2013/11/09 00:29:47 christos Exp $
 #
 # This file is intended to document workarounds for currently unsolved
 # (mostly) compiler bugs.
@@ -586,11 +586,13 @@ port	sh3
 		-fno-loop-optimize.
 	kcah
 
+port	sh3eb
 	hack	gcc4.8.1
 	cdate	Thu Nov  7 16:31:23 EST 2013
 	who	christos
 	file	src/sys/rump/net/lib/libnetbt/Makefile	: 1.2
 	desrc
+		for profiling
 		compile l2cap_signal.c with -O0 to avoid:
 		./netbt/l2cap_signal.c:36:
 		/p/netbsd/cvsroot/src/sys/rump/net/lib/libnetbt/../../../../\
@@ -600,6 +602,19 @@ port	sh3
 		  __asm volatile ("swap.b %1,%0" : "=r"(rval) : "r"(x));
 	kcah
 
+port	sh3el
+	hack	gcc4.8.1
+	cdate	Fri Nov  8 19:27:01 EST 2013
+	who	christos
+	file	src/external/bsd/libevent/lib/libevent/Makefile	: 1.2
+	desrc
+		for profiling
+		compile evdns.c with -O0 to avoid:
+		./sh3/byte_swap.h:20:2: error: 'asm' operand requires \
+		impossible reload
+		  __asm volatile ("swap.b %1,%0" : "=r"(rval) : "r"(x));
+	kcah
+
 port	m68000
 
 	hack	gcc4-m68000