[PATCH] Add ProgramFiles(x86) environment variable to defaults, fix some jaotc tests after graal sync

[Andrew Luo]

Recently we added auto-detection of VS2017+ linkers to graal's jaotc (see https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2019-January/032282.html), which uses the ProgramFiles(x86) environment variable to find VS2017+ linkers.  This change was included in the latest sync, however it doesn't work on WSL due to the ProgramFiles(x86) environment not being propagated from WSL to Win32.  I have a patch attached that fixes this (and tested by running tier 1 tests on WSL).

Feedback is welcome as always.

Thanks,

-Andrew

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