splitSymbols: fast-path for case where there is only one symbol

Signed-off-by: Paul Cacheux <paul.cacheux@datadoghq.com>

linker.go

@@ -57,10 +57,24 @@ func splitSymbols(insns asm.Instructions) (map[string]asm.Instructions, error) {
 		return nil, errors.New("insns is empty")
 	}
 
-	if insns[0].Symbol() == "" {
+	firstSymbol := insns[0].Symbol()
+	if firstSymbol == "" {
 		return nil, errors.New("insns must start with a Symbol")
 	}
 
+	onlyOneSymbol := true
+	for _, ins := range insns[1:] {
+		if ins.Symbol() != "" {
+			onlyOneSymbol = false
+			break
+		}
+	}
+	if onlyOneSymbol {
+		return map[string]asm.Instructions{
+			firstSymbol: insns,
+		}, nil
+	}
+
 	var name string
 	progs := make(map[string]asm.Instructions)
 	for _, ins := range insns {