Fix an issue of spirv_type used in local variable definitions

We previously use createOp() in SPV builder to create type declaration.
However, all type declarations should be placed in const-type-variable
declaration section. And duplicated type defintions ought to be avoided.
We now make a method in SPV builder to perform this operation with a
more general solution: makeGenericType().

Test/spv.intrinsicsSpirvTypeLocalVar.vert

@@ -0,0 +1,14 @@
+#version 460 core
+
+#extension GL_EXT_spirv_intrinsics: enable
+
+layout(constant_id = 9) const int size = 9;
+
+#define EmptyStruct spirv_type(id = 30)
+void func(EmptyStruct emptyStruct) {}
+
+void main()
+{
+    EmptyStruct dummy[size];
+    func(dummy[1]);
+}