WIP: SPV Remapper: add remapper test framework

Test/remap.similar_1b.everything.frag

@@ -0,0 +1,30 @@
+#version 450
+
+out vec4  outf4;
+in flat ivec4  ini4;
+in float  inf;
+
+float Test1(int bound)
+{
+    float r = 0;
+    for (int x=0; x<bound; ++x)
+        r += 0.5;
+    r += 0.2;
+    return r;
+}
+
+float Test2(int bound)
+{
+    if (bound > 2) {
+        return Test1(bound * 2);
+    } else
+        return float(bound * 4 +
+                     ini4.y * ini4.z +
+                     ini4.x);
+}
+
+void main()
+{
+    outf4 = vec4(Test1(int(inf)) + 
+                 Test2(int(inf)));
+}