git: openjdk/jdk11u-dev: 8267304: Bump global JTReg memory limit to 768m

[Aleksey Shipilev]

Changeset: 1ae15632
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2021-11-04 09:13:10 +0000
URL:       https://git.openjdk.java.net/jdk11u-dev/commit/1ae15632c7005eff2267aa6cdbacbc038c4b43c5

8267304: Bump global JTReg memory limit to 768m

Backport-of: e749f75de015fd9ef47f7a962f232e2ea677aba5

! make/RunTests.gmk