SPV arrays: Add support for runtime-sized array types and arrays of arrays.

This includes run-time block.member.length() (OpArrayLength).

Test/spv.AofA.frag

@@ -0,0 +1,43 @@
+#version 430
+
+in float infloat;
+out float outfloat;
+
+uniform uAofA {
+    float f[2][4];
+} nameAofA[3][5];
+
+float[4][5][6] many[1][2][3];
+
+float g4[4][7];
+in float g5[5][7];
+
+uniform int i, j, k;
+
+float[4][7] foo(float a[5][7])
+{
+    float r[7];
+    r = a[2];
+
+    return float[4][7](a[0], a[1], r, a[3]);
+}
+
+void main()
+{
+    outfloat = 0.0;
+
+    g4 = foo(g5);
+
+//    if (foo(g5) == g4)
+//        ++outfloat;
+
+    float u[][7];
+    u[2][2] = 3.0;
+    float u[5][7];
+
+    foo(u);
+
+    many[i][j][k][i][j][k] = infloat;
+    outfloat += many[j][j][j][j][j][j];
+    outfloat += nameAofA[1][2].f[0][3];
+}