[LLVM Diagnostic Capabilities] Remove useless includes from
DiagnosticPrinter.cpp.
These was creating a link time dependencies of IR on CodeGen and Analysis.

Part of <rdar://problem/15515174>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197447 91177308-0d34-0410-b5e6-96231b3b80d8
LoopVectorizer: Don't if-convert constant expressions that can trap

A phi node operand or an instruction operand could be a constant expression that
can trap (division). Check that we don't vectorize such cases.

PR16729
radar://15653590

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197449 91177308-0d34-0410-b5e6-96231b3b80d8
Revert r197438 and r197447 until we figure out how to avoid circular dependency at link time

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197451 91177308-0d34-0410-b5e6-96231b3b80d8