xtensa: fix gas trampolines regression

Extra condition 'abs (addr - trampaddr) < J_RANGE / 2' for trampoline
selection results in regressions: when relaxable jump is little longer
than J_RANGE so that single trampoline makes two new jumps, one longer
than J_RANGE / 2 and one shorter, correct trampoline cannot be found.

Drop that condition.

2015-05-13  Max Filippov  <jcmvbkbc@gmail.com>
gas/
	* config/tc-xtensa.c (xtensa_relax_frag): Allow trampoline to be
	closer than J_RANGE / 2 to jump frag.

gas/testsuite/
	* gas/xtensa/trampoline.s: Add regression testcase.

gas/ChangeLog

@@ -1,3 +1,8 @@
+2015-05-13  Max Filippov  <jcmvbkbc@gmail.com>
+
+	* config/tc-xtensa.c (xtensa_relax_frag): Allow trampoline to be
+	closer than J_RANGE / 2 to jump frag.
+
 2015-05-11  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* configure.tgt (arch): Set to iamcu for i386-*-elfiamcu target.

gas/config/tc-xtensa.c

@@ -9071,8 +9071,7 @@ xtensa_relax_frag (fragS *fragP, long stretch, int *stretched_p)
 
 	      trampaddr = fragP->fr_address + fragP->fr_fix;
 
-	      if ((addr + J_RANGE < trampaddr) ||
+	      if (addr + J_RANGE < trampaddr)
-		  abs (addr - trampaddr) < J_RANGE / 2)
 		continue;
 	      if (addr > trampaddr + J_RANGE)
 		break;

gas/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2015-05-13  Max Filippov  <jcmvbkbc@gmail.com>
+
+	* gas/xtensa/trampoline.s: Add regression testcase.
+
 2015-05-11  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* gas/i386/i386.exp: Run iamcu-1, iamcu-2, iamcu-3, iamcu-inval-1,

gas/testsuite/gas/xtensa/trampoline.s

@@ -26,3 +26,13 @@
 	.endr
 4:
 	j	4b
+
+5:
+	j	6f
+
+	.rep	43691
+	_nop
+	.endr
+
+6:
+	j	5b