SI-7783 Don't issue deprecation warnings for inferred TypeTrees

Deprecation checks in RefChecks were looking into all TypeTrees
to find references to deprecated type aliases. However, when the
compiler infers a type argument or type of a member it creates
a TypeTree (with a null original) that was also leading to warnings.

I ran into this problem often when upgrading a build from SBT 0.12
to 0.13: a plugin I was using used the deprecated type alias, and I
suffered transitively when I used methods from its API.

This commit disables the checks for inferred TypeTree-s.
Bump version to 2.10.4 for nightlies
Merge pull request #3009 from adriaanm/2.10.4

Bump version to 2.10.4 for nightlies
Merge pull request #2985 from retronym/ticket/7783

 Don't issue deprecation warnings for inferred TypeTrees
Merge remote-tracking branch 'scala/2.10.x' into merge-2.10.x

Conflicts:
	build.number
	test/files/neg/classmanifests_new_deprecations.check
Merge pull request #3041 from gkossakowski/merge-2.10.x

Merge 2.10.x into master