Implement GL_EXT_scalar_block_layout

Test/spv.scalarlayout.frag

@@ -0,0 +1,32 @@
+#version 450 core
+
+#extension GL_EXT_scalar_block_layout : enable
+
+// Block memory layout
+struct S
+{
+    float      a;   // offset 0
+    vec2       b;   // offset 4
+    double     c;   // offset 16
+    float      d;   // offset 24
+    vec3       e;   // offset 28
+    float      f;   // offset 40
+    // size = 44, align = 8
+};
+
+layout(column_major, scalar) uniform B1
+{
+    float      a;     // offset = 0
+    vec2       b;     // offset = 4
+    vec3       c;     // offset = 12
+    float      d[2];  // offset = 24
+    mat2x3     e;     // offset = 32, takes 24 bytes, matrixstride = 12
+    mat2x3     f[2];  // offset = 56, takes 48 bytes, matrixstride = 12, arraystride = 24
+    float      g;     // offset = 104
+    S          h;     // offset = 112 (aligned to multiple of 8)
+    S          i[2];  // offset = 160 (aligned to multiple of 8) stride = 48
+};
+
+void main()
+{
+}