Add more tests of acos.

This patch adds some randomly-generated tests of acos that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of acos.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.

ChangeLog

@@ -1,5 +1,10 @@
 2015-03-25  Joseph Myers  <joseph@codesourcery.com>
 
+	* math/auto-libm-test-in: Add more tests of acos.
+	* math/auto-libm-test-out: Regenerated.
+	* sysdeps/i386/fpu/libm-test-ulps: Update.
+	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
+
 	* math/auto-libm-test-in: Add more tests of expm1.
 	* math/auto-libm-test-out: Regenerated.
 	* sysdeps/i386/fpu/libm-test-ulps: Update.

math/auto-libm-test-in

@@ -64,6 +64,12 @@ acos -0x1p-65
 acos -0x1p-85
 acos -0x1p-105
 acos -0x1p-125
+acos -0x2.0089a4p-4
+acos 0xf.04aeep-4
+acos 0x5.dd258006121b8p-4
+acos -0x2.35f051e70dbc4p-4
+acos 0xe.9a5c0d7fabb9aa1p-4
+acos 0xe.17513589de79b75p-4
 acos min
 acos -min
 acos min_subnorm