feat(parser): evaluate the TEXT and GLOBL flags operand as one expression

Assisted-by: GLM 5.3 Flash

ast/ast.go

@@ -58,8 +58,14 @@ type Text struct {
 	Keyword token.Token // the TEXT token
 	Name    *Symbol     // ·funcName(SB)
 	Flags   []string    // NOSPLIT, DUPOK, …
-	Frame   *Operand    // $0
-	Args    *Operand    // the -65 part; nil when absent
+	// FlagVal is the flags operand as the toolchain reads it: one integer
+	// the operand evaluates to, the OR of the named flags and any literals
+	// written beside them.  Zero when the TEXT carries no flags operand, and
+	// after an evaluation failure, where Flags still carries the scanned
+	// names beside the diagnostic.
+	FlagVal int64
+	Frame   *Operand // $0
+	Args    *Operand // the -65 part; nil when absent
 	Body    []Stmt
 	Doc     string // preceding comment block (typically the Go signature)
 }
@@ -72,6 +78,10 @@ type Globl struct {
 	Keyword token.Token
 	Name    *Symbol
 	Flags   []string
+	// FlagVal is the flags operand folded to the one integer the toolchain
+	// evaluates it as, exactly as on Text.  Zero when the GLOBL carries no
+	// flags operand or the operand failed to evaluate.
+	FlagVal int64
 	Size    *Operand
 }