[DWARF parser] Fix broken address ranges construction.

Previous algorithm for constructing [Address ranges]->[Compile Units]
mapping was wrong. It somewhat relied on the assumption that address ranges
for different compile units may not overlap. It is not so.
For example, two compile units may contain the definition of the same
linkonce_odr function. These definitions will be merged at link-time,
resulting in equivalent .debug_ranges entries for both these units

Instead of sorting and merging original address ranges (from .debug_ranges
and .debug_aranges), implement a different approach: save endpoints
of all ranges, and then use a sweep-line approach to construct
the desired mapping. If we find that certain address maps to
several compilation units, we just pick any of them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210860 91177308-0d34-0410-b5e6-96231b3b80d8
Move to a private function to initialize subtarget dependencies
so we can use initializer lists for the ARMSubtarget and then
use this to initialize a moved DataLayout on the subtarget from
the TargetMachine.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210861 91177308-0d34-0410-b5e6-96231b3b80d8
Move ARMSelectionDAGInfo from the TargetMachine to the subtarget.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210862 91177308-0d34-0410-b5e6-96231b3b80d8
[FastISel][X86] - Add branch weights

Add branch weights to branch instructions, so that the following passes can
optimize based on it (i.e. basic block ordering).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210863 91177308-0d34-0410-b5e6-96231b3b80d8