Move GlobalMerge from Transform to CodeGen.

This patch is to move GlobalMerge pass from Transform/Scalar                                                           
to CodeGen, because GlobalMerge depends on TargetMachine.
In the mean time, the macro INITIALIZE_TM_PASS is also moved
to CodeGen/Passes.h. With this fix we can avoid making
libScalarOpts depend on libCodeGen.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210951 91177308-0d34-0410-b5e6-96231b3b80d8
Complete remove test/Transforms/GlobalMerge.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210952 91177308-0d34-0410-b5e6-96231b3b80d8
Move ARMJITInfo off of the TargetMachine and down onto the subtarget.
This required untangling a mess of headers that included around.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210953 91177308-0d34-0410-b5e6-96231b3b80d8
Remove InstrItineraryData off of the TargetMachine - it's already
on the subtarget and just forward the accessor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210955 91177308-0d34-0410-b5e6-96231b3b80d8