X86AsmPrinter MCJIT MSVC bug fix.

Summary:
This bug was introduced in r213006 which makes an assumption that MCSection is COFF for Windows MSVC. This assumption is broken for MCJIT users where ELF is used instead [1]. The fix is to change the MCSection cast to a dyn_cast.

[1] http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-December/068407.html.

Reviewers: majnemer

Reviewed By: majnemer

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D4872

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216173 91177308-0d34-0410-b5e6-96231b3b80d8
Move DisableGVNLoadPRE from populateLTOPassManager to PassManagerBuilder.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216174 91177308-0d34-0410-b5e6-96231b3b80d8
DAGCombiner: Make concat_vector combine safe for EVTs and concat_vectors with many arguments.

PR20677

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216175 91177308-0d34-0410-b5e6-96231b3b80d8
[CLNUP] Remove return after llvm_unreachable. Thanks to Hal Finkel for pointing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216176 91177308-0d34-0410-b5e6-96231b3b80d8
Handle inlining in populateLTOPassManager like in populateModulePassManager.

No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216178 91177308-0d34-0410-b5e6-96231b3b80d8