Update BuildTools, CoreClr to preview2-02606-01, preview2-26305-12, respectively...
authordotnet-maestro-bot <dotnet-maestro-bot@microsoft.com>
Tue, 6 Mar 2018 01:58:53 +0000 (19:58 -0600)
committerAhson Khan <ahkha@microsoft.com>
Tue, 6 Mar 2018 01:58:53 +0000 (17:58 -0800)
commit06cdbf862336ec593a6ed242c7dcc5817f645c36
treeeec4a9cef9ba73affda7989095809b4c75a089bb
parentaa59371287e2051e122ab48498cab9d7ed0cacd0
Update BuildTools, CoreClr to preview2-02606-01, preview2-26305-12, respectively (dotnet/core-setup#3779)

Commit migrated from https://github.com/dotnet/core-setup/commit/7df1b9ea439503ca5219e747fa5634107dc5f096
src/installer/BuildToolsVersion.txt
src/installer/dependencies.props