upgrade enum discriminants

compiler/ast/ast.odin

@@ -254,6 +254,19 @@ Global :: struct {
 	diagnostic: source.Diagnostic_Id,
 }
 
+Enum_Value :: struct {
+	expr:     Expr_Id,
+	span:     source.Span,
+	explicit: bool,
+}
+
+Enum_Declaration :: struct {
+	type:   types.Type,
+	pkg:    Package_Id,
+	file:   File_Id,
+	values: []Enum_Value,
+}
+
 Import :: struct {
 	span:       source.Span,
 	alias:      symbol.Id,
@@ -326,6 +339,7 @@ Module :: struct {
 	statements: [dynamic]Stmt,
 	functions:  [dynamic]Function,
 	globals:    [dynamic]Global,
+	enum_declarations: [dynamic]Enum_Declaration,
 	imports:    [dynamic]Import,
 	aliases:    [dynamic]Declaration_Alias,
 	files:      [dynamic]File,
@@ -347,6 +361,7 @@ init_module :: proc(allocator := context.allocator) -> Module {
 	module.statements.allocator = allocator
 	module.functions.allocator = allocator
 	module.globals.allocator = allocator
+	module.enum_declarations.allocator = allocator
 	module.imports.allocator = allocator
 	module.aliases.allocator = allocator
 	module.files.allocator = allocator
@@ -382,6 +397,9 @@ destroy_module :: proc(module: ^Module) {
 	for global in module.globals {
 		delete(global.link_name, module.allocator)
 	}
+	for declaration in module.enum_declarations {
+		delete(declaration.values, module.allocator)
+	}
 	for pkg in module.packages {
 		delete(pkg.path, module.allocator)
 	}
@@ -400,6 +418,7 @@ destroy_module :: proc(module: ^Module) {
 	delete(module.statements)
 	delete(module.functions)
 	delete(module.globals)
+	delete(module.enum_declarations)
 	delete(module.imports)
 	delete(module.aliases)
 	delete(module.files)