Go patch committed: remove unneeded zero-length slice value init

[Ian Lance Taylor]

This patch by Than McIntosh removes an unnecessary initializer when
building the set of values to store in a slice of zero length.  This
removes some code that dates back to 2008 and may have something to do
with different handling of nil slices back then (I no longer recall).
Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu.  Committed
to mainline.

Ian

Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE     (revision 243619)
+++ gcc/go/gofrontend/MERGE     (working copy)
@@ -1,4 +1,4 @@
-556a546ba3c7bb14bd1b9b8469ee3b7a914909f6
+5eb55901861f360c2c2ff70f14a8315694934c97
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: gcc/go/gofrontend/expressions.cc
===================================================================
--- gcc/go/gofrontend/expressions.cc    (revision 243442)
+++ gcc/go/gofrontend/expressions.cc    (working copy)
@@ -12926,12 +12926,6 @@ Slice_construction_expression::create_ar
   go_assert(this->valtype_ != NULL);
 
   Expression_list* vals = this->vals();
-  if (this->vals() == NULL || this->vals()->empty())
-    {
-      // We need to create a unique value for the empty array literal.
-      vals = new Expression_list;
-      vals->push_back(NULL);
-    }
   return new Fixed_array_construction_expression(
       this->valtype_, this->indexes(), vals, loc);
 }