hg: jdk/sandbox: Merge

[magnus.ihse.bursie at oracle.com]

Changeset: 7a46ec9f0895
Author:    ihse
Date:      2020-04-28 15:46 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/7a46ec9f0895

Merge

! make/CompileJavaModules.gmk
! make/CompileToolsJdk.gmk
! make/autoconf/boot-jdk.m4
! make/autoconf/bootcycle-spec.gmk.in
! make/autoconf/configure.ac
! make/autoconf/spec.gmk.in
! make/test/BuildMicrobenchmark.gmk
! make/test/JtregGraalUnit.gmk