Add target thumbv7a-pc-windows-msvc#53621

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bors merged 4 commits intorust-lang:masterfrom

jordanrh1:windows-arm

Sep 13, 2018

Commits on Sep 4, 2018

Add target thumbv7a-pc-windows-msvc
jordanrh1
committed

Commits on Sep 7, 2018

Commits on Sep 12, 2018

Expand comments in thumbv7a-pc-windows-msvc target spec
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