vect: Fix scalar stmt typo in vect_optimize_slp_pass [PR106886]

Fix a stupid typo in my vect_optimize_slp_pass patch.

gcc/
	PR tree-optimization/106886
	* tree-vect-slp.cc (vect_optimize_slp_pass::get_result_with_layout):
	Fix copying of scalar stmts.

gcc/testsuite/
	PR tree-optimization/106886
	* gcc.dg/vect/bb-slp-layout-21.c: New test.

Author: rsandifo-arm

gcc/testsuite/gcc.dg/vect/bb-slp-layout-21.c

@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-march=bdver2" { target x86_64-*-* i?86-*-* } } */
+
+int rl2GeomExport64_little_endian, rl2GeomExport64_little_endian_arch;
+void rl2GeomExport64(unsigned char *p, double value) {
+  union {
+    unsigned char byte[8];
+    double double_value;
+  } convert;
+  convert.double_value = value;
+  if (rl2GeomExport64_little_endian_arch)
+    if (rl2GeomExport64_little_endian) {
+      *(p + 7) = convert.byte[0];
+      *(p + 6) = convert.byte[1];
+      *(p + 5) = convert.byte[2];
+      *(p + 4) = convert.byte[3];
+      *(p + 3) = convert.byte[4];
+      *(p + 2) = convert.byte[5];
+      *(p + 1) = convert.byte[6];
+      *p = convert.byte[7];
+    } else
+      *p = convert.byte[7];
+}

gcc/tree-vect-slp.cc

@@ -5212,7 +5212,7 @@ vect_optimize_slp_pass::get_result_with_layout (slp_tree node,
       if (SLP_TREE_SCALAR_STMTS (node).length ())
 	{
 	  auto &stmts = SLP_TREE_SCALAR_STMTS (result);
-	  stmts.safe_splice (SLP_TREE_SCALAR_STMTS (result));
+	  stmts.safe_splice (SLP_TREE_SCALAR_STMTS (node));
 	  if (from_layout_i != 0)
 	    vect_slp_permute (m_perms[from_layout_i], stmts, false);
 	  if (to_layout_i != 0)