Prevent fallback on default branch for case EbtSamplerCubeShadow

BUG=angleproject:1549

Change-Id: I8f003257b6f39282cb52ccdbacb73860ab37c919
Reviewed-on: https://chromium-review.googlesource.com/390271
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
diff --git a/src/compiler/translator/TextureFunctionHLSL.cpp b/src/compiler/translator/TextureFunctionHLSL.cpp
index a071900..33d0985 100644
--- a/src/compiler/translator/TextureFunctionHLSL.cpp
+++ b/src/compiler/translator/TextureFunctionHLSL.cpp
@@ -393,41 +393,22 @@
     {
         switch (textureFunction.sampler)
         {
-            case EbtSampler2D:
-                out << ", int2 offset";
-                break;
             case EbtSampler3D:
-                out << ", int3 offset";
-                break;
-            case EbtSampler2DArray:
-                out << ", int2 offset";
-                break;
-            case EbtISampler2D:
-                out << ", int2 offset";
-                break;
             case EbtISampler3D:
-                out << ", int3 offset";
-                break;
-            case EbtISampler2DArray:
-                out << ", int2 offset";
-                break;
-            case EbtUSampler2D:
-                out << ", int2 offset";
-                break;
             case EbtUSampler3D:
                 out << ", int3 offset";
                 break;
+            case EbtSampler2D:
+            case EbtSampler2DArray:
+            case EbtISampler2D:
+            case EbtISampler2DArray:
+            case EbtUSampler2D:
             case EbtUSampler2DArray:
-                out << ", int2 offset";
-                break;
             case EbtSampler2DShadow:
-                out << ", int2 offset";
-                break;
             case EbtSampler2DArrayShadow:
-                out << ", int2 offset";
-                break;
             case EbtSamplerExternalOES:
                 out << ", int2 offset";
+                break;
             default:
                 UNREACHABLE();
         }