Fix build regression on Linux

Chromium's Linux toolchain doesn't implement the return value of
std::vector::insert correctly, causing a build failure. Remove an
unnecessary assignment of the return value to fix this build regression.

The regression was caused by the commit:
"Put each array declarator into a separate declaration in HLSL output"

TEST=angle_unittests

Change-Id: I2959122d28e4c7e6d6a4d842a97a8f1fd4f27ca1
Reviewed-on: https://chromium-review.googlesource.com/266990
Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
Tested-by: Olli Etuaho <oetuaho@nvidia.com>
diff --git a/src/compiler/translator/IntermNode.cpp b/src/compiler/translator/IntermNode.cpp
index a8018a4..67ec256 100644
--- a/src/compiler/translator/IntermNode.cpp
+++ b/src/compiler/translator/IntermNode.cpp
@@ -202,7 +202,7 @@
         if (*it == original)
         {
             it = mSequence.erase(it);
-            it = mSequence.insert(it, replacements.begin(), replacements.end());
+            mSequence.insert(it, replacements.begin(), replacements.end());
             return true;
         }
     }