New warnings output under legacyOptimizations spammy

[kevinpschaaf]

Description

The warnings added for binding to undeclared properties in #5473 miss a few different cases where valid properties can be bound:

• templatizer "instance properties" (such as the item property in a dom-repeat)
• methods used in template with no arguments or only literal arguments (e.g. [[noDeps()]] or [[onlyLiterals('foo', 42)]]

Versions

• Polymer: v3.x (master)

[stale]

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