Linker: Fix #1329: correctly merge unsized arrays, and fix link tests.

Test/link2.vk.frag

@@ -2,7 +2,22 @@
 
 layout(binding=1) uniform sampler2D s2D;
 
+int a1[];  // max size from link1
+int a2[];  // max size from link2
+int b[];
+int c[7];
+int i;
+
+buffer bnameRuntime  { float r[]; };
+buffer bnameImplicit { float m[4]; };
+
 vec4 getColor()
 {
-  return texture(s2D, vec2(0.5));
+    a1[2] = 1;
+    a2[9] = 1;
+    b[2] = 1;
+    c[3] = 1;
+    c[i] = 1;
+
+    return texture(s2D, vec2(0.5));
 }