Add some Android-changed markers to boxed primitive types.

This change adds or clarifies some markers of changes relative to
OpenJDK 8u121-b13.

N.B. There are still unmarked changes in Character.java.

Test: make checkbuild
Change-Id: I9cd8f2e8e9ee042cd6ac2dff2b4531651f5ced64
7 files changed