[Flint] adding IR lowering and printer

[IR] switching from "passes" to "transformers" for clarity

src/intel/compiler/ir/ir.zig

@@ -0,0 +1,9 @@
+pub const id = @import("id.zig");
+pub const instruction = @import("instruction.zig");
+pub const operand = @import("operand.zig");
+pub const printer = @import("printer.zig");
+pub const program = @import("program.zig");
+pub const validator = @import("validator.zig");
+
+pub const Program = program.Program;
+pub const Stage = program.Stage;