Add switch/case/default statements, using a switch node that contains a sequence of case/default nodes and top-level nodes of the code chunks in between them.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@21131 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/switch.frag

@@ -0,0 +1,64 @@
+#version 300 es
+
+uniform int c, d;
+in float x;
+
+void main()
+{
+    float f;
+    int a[2];
+
+    switch(f) { // ERROR
+    }
+
+    switch(a) { // ERROR
+    }
+
+    switch(c)
+    {
+    }
+
+    switch(c)
+    {
+    case 2:    // ERROR, not enough stuff
+    }
+
+    switch(c)
+    {
+        f = sin(x); // ERRROR
+    case 2:    // ERROR, not enough stuff
+        f = cos(x);
+        break;
+    }
+
+    switch (c) {
+    case 1:
+        f = sin(x);
+        break;
+    case 2:
+        f = cos(x);
+        break;
+    default:
+        f = tan(x);
+    }
+
+    switch (c) {
+    case 1:
+        f = sin(x);
+        break;
+    case 2:
+        switch (d) {
+        case 1:
+            f = x * x * x;
+            break;
+        case 2:
+            f = x * x;
+            break;
+        }
+        break;
+    default:
+        f = tan(x);
+    }
+
+    break; // ERROR
+}