[analyzer] Add an integer version of the Circle tests in uninit-vals.m.

A floating-point version is nice for testing unknown values, but it's
good to be able to check all parts of the structure as well.

Test change only, no functionality change.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@177455 91177308-0d34-0410-b5e6-96231b3b80d8
Simplify/generalize some debug info test cases

Mostly, try to depend on the annotation comments more so these tests are more
legible, brief, and agnostic to schema changes in the future (sure, they're not
agnostic to changes to the comment annotations but since they're easier to read
they should be easier to update if that happens).

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@177457 91177308-0d34-0410-b5e6-96231b3b80d8