[analyzer] Don't track autorelease pools created by +new.

This matches our behavior for autorelease pools created by +alloc. Some
people like to create autorelease pools in one method and release them
somewhere else.

If you want safe autorelease pool semantics, use the new ARC-compatible
syntax: @autoreleasepool { ... }

<rdar://problem/13121353>

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174096 91177308-0d34-0410-b5e6-96231b3b80d8
[analyzer]RetainCount: Fix an autorelease related false positive.

The Cnt variable is adjusted (incremented) for simplification of
checking logic. The increment should not be stored in the state.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174104 91177308-0d34-0410-b5e6-96231b3b80d8