reflect: avoid dereferencing non-pointers in mapassign#718

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hajimehoshi wants to merge 2 commits intogopherjs:masterfrom

hajimehoshi:662-unsafe

Commits on Nov 7, 2017

Call only when possible at reflect.mapassign
hajimehoshi
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Commits on Nov 10, 2017

Use reflect package directly in the test
hajimehoshi
committed