hg: jdk/sandbox: 8220093: Change to GCC 8.2 for building on Linux at Oracle

[chris.hegarty at oracle.com]

Changeset: 62e4ada7c4c8
Author:    erikj
Date:      2019-03-15 09:13 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/62e4ada7c4c8

8220093: Change to GCC 8.2 for building on Linux at Oracle
Reviewed-by: tbell

! make/autoconf/toolchain.m4
! make/conf/jib-profiles.js
! make/devkit/Makefile
+ make/devkit/Tars.gmk
! make/devkit/Tools.gmk