Allow 'continue' statements in 'foreach' loops.

tests/foreach-21.ispc

@@ -0,0 +1,20 @@
+
+export uniform int width() { return programCount; }
+
+
+uniform int foo(int i);
+
+export void f_f(uniform float RET[], uniform float aFOO[]) {
+    for (uniform int i = 0; i < programCount; ++i)
+        RET[i] = 0;
+
+    foreach (i = 0 ... programCount) {
+        if (i % 2)
+            ccontinue;
+        RET[i] = 1;
+    }
+}
+
+export void result(uniform float RET[]) {
+    RET[programIndex] = (programIndex % 2) ? 0 : 1;
+}