xtensa: fix libgcc build with --text-section-literals

Functions __muldf3_aux, __divdf3_aux, __mulsf3_aux and __divsf3_aux
don't start with leaf_entry, so they need explicit .literal_position,
otherwise libgcc build fails in the presence of --text-section-literals.

2016-02-17  Max Filippov  <jcmvbkbc@gmail.com>
libgcc/
	* config/xtensa/ieee754-df.S (__muldf3_aux, __divdf3_aux): Add
	.literal_position before the function.
	* config/xtensa/ieee754-sf.S (__mulsf3_aux, __divsf3_aux):
	Likewise.

From-SVN: r233505

libgcc/ChangeLog

+2016-02-17  Max Filippov  <jcmvbkbc@gmail.com>
+
+	* config/xtensa/ieee754-df.S (__muldf3_aux, __divdf3_aux): Add
+	.literal_position before the function.
+	* config/xtensa/ieee754-sf.S (__mulsf3_aux, __divsf3_aux):
+	Likewise.
+
 2016-02-15  Marcin Kościelnicki  <koriakin@0x04.net>
 
 	* config.host: Use t-stack and t-stack-s390 for s390*-*-linux.

libgcc/config/xtensa/ieee754-df.S

@@ -606,6 +606,7 @@ __subdf3:
 #define XCHAL_NO_MUL 1
 #endif
 
+	.literal_position
 __muldf3_aux:
 
 	/* Handle unusual cases (zeros, subnormals, NaNs and Infinities).
@@ -1216,6 +1217,7 @@ __muldf3:
 
 #ifdef L_divdf3
 
+	.literal_position
 	/* Division */
 __divdf3_aux:
 

libgcc/config/xtensa/ieee754-sf.S

@@ -487,6 +487,7 @@ __subsf3:
 #define XCHAL_NO_MUL 1
 #endif
 
+	.literal_position
 __mulsf3_aux:
 
 	/* Handle unusual cases (zeros, subnormals, NaNs and Infinities).
@@ -884,6 +885,7 @@ __mulsf3:
 
 #ifdef L_divsf3
 
+	.literal_position
 	/* Division */
 __divsf3_aux: