Revert r310716 (and r310735): [globalisel][tablegen] Support zero-instruction emission.

Two of the Windows bots are failing test\CodeGen\X86\GlobalISel\select-inc.mir
which should not have been affected by the change. Reverting while I investigate.

Also reverted r310735 because it builds on r310716.

llvm-svn: 310745

1 files changed, 1 insertions, 11 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp b/llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp
index 22586a1708e..1b45f87bc72 100644
--- a/llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp
+++ b/llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp
@@ -1163,18 +1163,8 @@ bool AArch64InstructionSelector::select(MachineInstr &I) const {
 
 
   case TargetOpcode::G_INTTOPTR:
-    // The importer is currently unable to import pointer types since they
-    // didn't exist in SelectionDAG.
-    return selectCopy(I, TII, MRI, TRI, RBI);
-
   case TargetOpcode::G_BITCAST:
-    // Imported SelectionDAG rules can handle every bitcast except those that
-    // bitcast from a type to the same type. Ideally, these shouldn't occur
-    // but we might not run an optimizer that deletes them.
-    if (MRI.getType(I.getOperand(0).getReg()) ==
-        MRI.getType(I.getOperand(1).getReg()))
-      return selectCopy(I, TII, MRI, TRI, RBI);
-    return false;
+    return selectCopy(I, TII, MRI, TRI, RBI);
 
   case TargetOpcode::G_FPEXT: {
     if (MRI.getType(I.getOperand(0).getReg()) != LLT::scalar(64)) {