git: openjdk/jdk-sandbox: json: perf for key parsing: defer sb until escape seen

[duke]

Changeset: 583dba43
Branch: json
Author:    Justin Lu <justin.lu at oracle.com>
Date:      2025-01-15 16:45:02 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/583dba4324ab5fe75dc453d107554a1828ab78cd

perf for key parsing: defer sb until escape seen

! src/java.base/share/classes/java/util/json/JsonParser.java
! test/jdk/java/util/json/TestJsonObject.java