adding backend agnostic IR

src/intel/FlintShaderModule.zig

@@ -8,6 +8,7 @@ const Self = @This();
 pub const Interface = base.ShaderModule;
 
 interface: Interface,
+code: []u32,
 ref_count: std.atomic.Value(usize),
 
 pub fn create(device: *base.Device, allocator: std.mem.Allocator, info: *const vk.ShaderModuleCreateInfo) VkError!*Self {
@@ -16,9 +17,13 @@ pub fn create(device: *base.Device, allocator: std.mem.Allocator, info: *const v
 
     var interface = try Interface.init(device, allocator, info);
     interface.vtable = &.{ .destroy = destroy };
+    if (info.code_size % @sizeOf(u32) != 0) return VkError.ValidationFailed;
+    const code = allocator.dupe(u32, info.p_code[0 .. info.code_size / @sizeOf(u32)]) catch return VkError.OutOfHostMemory;
+    errdefer allocator.free(code);
 
     self.* = .{
         .interface = interface,
+        .code = code,
         .ref_count = std.atomic.Value(usize).init(1),
     };
     return self;
@@ -30,6 +35,7 @@ pub fn destroy(interface: *Interface, allocator: std.mem.Allocator) void {
 }
 
 pub fn drop(self: *Self, allocator: std.mem.Allocator) void {
+    allocator.free(self.code);
     allocator.destroy(self);
 }