Revert ARM Scheduler Model: Add resources instructions, map resources

This reverts commit r177968. It is causing failures in a local build bot.

"fatal error: error in backend: Expected a variant SchedClass"

Original commit message:
Move the CortexA9 resources into the CortexA9 SchedModel namespace. Define
resource mappings under the CortexA9 SchedModel. Define resources and mappings
for the SwiftModel.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178028 91177308-0d34-0410-b5e6-96231b3b80d8
Hexagon: Remove HexagonMCInst.h file. It has been replaced with MCTargetDesc/HexagonMCInst.h.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178030 91177308-0d34-0410-b5e6-96231b3b80d8
Make InstCombineCasts.cpp:OptimizeIntToFloatBitCast endian safe.

The OptimizeIntToFloatBitCast converts shift-truncate sequences
into extractelement operations.  The computation of the element
index to be used in the resulting operation is currently only
correct for little-endian targets.

This commit fixes the element index computation to be correct
for big-endian targets as well.  If the target byte order is
unknown, the optimization cannot be performed at all.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178031 91177308-0d34-0410-b5e6-96231b3b80d8
Hexagon: Use multiclass for aslh, asrh, sxtb, sxth, zxtb and zxth.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178032 91177308-0d34-0410-b5e6-96231b3b80d8