Add bundle aware API for querying instruction properties and switch the code

generator to it. For non-bundle instructions, these behave exactly the same
as the MC layer API.

For properties like mayLoad / mayStore, look into the bundle and if any of the
bundled instructions has the property it would return true.
For properties like isPredicable, only return true if *all* of the bundled
instructions have the property.
For properties like canFoldAsLoad, isCompare, conservatively return false for
bundles.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146026 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineBasicBlock.cpp

@@ -538,8 +538,8 @@ bool MachineBasicBlock::canFallThrough() {
     // Barrier is predicated and thus no longer an actual control barrier. This
     // is over-conservative though, because if an instruction isn't actually
     // predicated we could still treat it like a barrier.
-    return empty() || !back().getDesc().isBarrier() ||
-           back().getDesc().isPredicable();
+    return empty() || !back().isBarrier() ||
+           back().isPredicable();
   }
 
   // If there is no branch, control always falls through.
@@ -737,7 +737,7 @@ void MachineBasicBlock::ReplaceUsesOfBlockWith(MachineBasicBlock *Old,
   MachineBasicBlock::insn_iterator I = insn_end();
   while (I != insn_begin()) {
     --I;
-    if (!I->getDesc().isTerminator()) break;
+    if (!I->isTerminator()) break;
 
     // Scan the operands of this machine instruction, replacing any uses of Old
     // with New.