• Please check if the PR fulfills these requirements
• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit-message-format
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Fix

• What is the current behavior? (You can also link to an open issue here)
  metadata collection doesn't include Provider #8223

No enough metadata is collected to handle Provider instances.

• What is the new behavior (if this is a feature change)?

Records new expressions and unfolds forwardRef calls.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

No.

• Other information:

Preserves constructor calls in addition to function calls.
Introduced a special case for forwardRef() similar to CONST_EXPR.