fix(compiler-core): warn for empty vOn expression + improve performan…#1719

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underfin wants to merge 2 commits intovuejs:masterfrom underfin:fix-empty-von-exp

+33-18

Commits on Jul 27, 2020

fix(compiler-core): warn for empty vOn expression + improve performance of detect cache props
underfin
committed
refactor: take context arguments first
underfin
committed