clang-cl: Use .obj as extension for unnamed object files (PR17095)

We already use .obj as extension when the user provides a stem file
name (via /Fo), but were failing in the most basic case when the file
name is based on the input file.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190071 91177308-0d34-0410-b5e6-96231b3b80d8
ObjectiveC modern translator: fix up generated fast enumeration
code to work for bit 32bit and 64bit APIs.
// rdar://14913632


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190072 91177308-0d34-0410-b5e6-96231b3b80d8
Mark lambda closure classes as being implicitly-generated.

Summary: Closure classes for C++ lambdas are always compiler-generated.  This one-line change calls setImplicit(true) on them at creation time, such that a default RecursiveASTVisitor (or any for which shouldVisitImplicitCode returns false) will skip them.

Reviewers: rsmith, dblaikie

Reviewed By: dblaikie

CC: klimek, revane, cfe-commits, jordan_rose

Differential Revision: http://llvm-reviews.chandlerc.com/D1593

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190073 91177308-0d34-0410-b5e6-96231b3b80d8