SelectionDAG: slightly refactor DAGCombiner::visitSELECT_CC to avoid redudant checks...

This doesn't really effect performance due to all the relevant calls being transparent but is clearer. 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184027 91177308-0d34-0410-b5e6-96231b3b80d8
MI-Sched: DEBUG: print critical resource.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184028 91177308-0d34-0410-b5e6-96231b3b80d8
MI-Sched: added tracking of dependent latency for better heuristics.

Heuristics compare the critical path in the scheduled code, called
ExpectedLatency, with the latency of instructions remaining to be
scheduled. There are two ways to look at remaining latency:

(1) Dependent latency includes the latency between unscheduled and
scheduled instructions.

(2) Independent latency is simply the height (bottom-up) or depth
(top-down) of instructions currently in the ready Q.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184029 91177308-0d34-0410-b5e6-96231b3b80d8
MI-Sched: Remove the temporary EnableCopyConstrain flag.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184030 91177308-0d34-0410-b5e6-96231b3b80d8
MI-Sched: Rename IssueCount to CurrMOps.

"Counts" refer to scaled resource counts within a region. CurrMOps is
simply the number of micro-ops to be issue in the current cycle.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184031 91177308-0d34-0410-b5e6-96231b3b80d8
Machine Model: Add MicroOpBufferSize and resource BufferSize.

Replace the ill-defined MinLatency and ILPWindow properties with
with straightforward buffer sizes:
MCSchedMode::MicroOpBufferSize
MCProcResourceDesc::BufferSize

These can be used to more precisely model instruction execution if desired.

Disabled some misched tests temporarily. They'll be reenabled in a few commits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184032 91177308-0d34-0410-b5e6-96231b3b80d8
Update machine models. Specify buffer sizes for OOO processors.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184033 91177308-0d34-0410-b5e6-96231b3b80d8
Support BufferSize on ProcResGroup for unified MOp schedulers.

And add Sandybridge/Haswell resource buffers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184034 91177308-0d34-0410-b5e6-96231b3b80d8