Add GN configs for "Libfuzzer Upload Linux ASan/MSan" builders
Add GN configs for "Libfuzzer Upload Linux ASan/MSan" builders

The original Libfuzzer Upload Linux builder config will be removed after landing
corresponding master config change https://codereview.chromium.org/1572393005/

R=phajdan.jr@chromium.org, sergiyb@chromium.org
BUG=569044

Review URL: https://codereview.chromium.org/1581443005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#368855}

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