[PATCH][i386][obvious] Use std::swap instead of manually swapping in a couple of places

[Kyrill Tkachov]

Hi all,

Bootstrapped and tested on x86_64-linx.
Will commit shortly as obvious.

Thanks,
Kyrill

2015-06-19  Kyrylo Tkachov  <kyrylo.tkac...@arm.com>

    * config/i386/i386.c (ix86_function_versions): Use std::swap instead
    of manually swapping.
    (expand_vec_perm_interleave2): Likewise.

commit c4e17657d5557ec58e910b9cdecdda85f9bb196a
Author: Kyrylo Tkachov <kyrylo.tkac...@arm.com>
Date:   Fri Jun 19 10:45:52 2015 +0100

    [i386] Use std::swap instead of manually swapping in a couple of places

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 622c5f5..4cb8fe8 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -34903,9 +34903,7 @@ ix86_function_versions (tree fn1, tree fn2)
 	{
 	  if (attr2 != NULL_TREE)
 	    {
-	      tree tem = fn1;
-	      fn1 = fn2;
-	      fn2 = tem;
+	      std::swap (fn1, fn2);
 	      attr1 = attr2;
 	    }
 	  error_at (DECL_SOURCE_LOCATION (fn2),
@@ -47911,9 +47909,7 @@ expand_vec_perm_interleave2 (struct expand_vec_perm_d *d)
 	    {
 	      /* Attempt to increase the likelihood that dfinal
 		 shuffle will be intra-lane.  */
-	      char tmph = nonzero_halves[0];
-	      nonzero_halves[0] = nonzero_halves[1];
-	      nonzero_halves[1] = tmph;
+	      std::swap (nonzero_halves[0], nonzero_halves[1]);
 	    }
 
 	  /* vperm2f128 or vperm2i128.  */