switch the lld bot (and use_lld=1 builds) to use the new COFF linker
switch the lld bot (and use_lld=1 builds) to use the new COFF linker

depends on https://codereview.chromium.org/1220783003/

BUG=506453
NOTRY=true
TBR=rnk

Review URL: https://codereview.chromium.org/1218873008

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#337258}

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