Teach AnalyzeBranch, RemoveBranch and the branch

folder to be tolerant of debug info following the
branch(es) at the end of a block.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100168 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/SystemZ/SystemZInstrInfo.cpp

@@ -424,6 +424,8 @@ bool SystemZInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
   MachineBasicBlock::iterator I = MBB.end();
   while (I != MBB.begin()) {
     --I;
+    if (I->isDebugValue())
+      continue;
     // Working from the bottom, when we see a non-terminator
     // instruction, we're done.
     if (!isUnpredicatedTerminator(I))
@@ -500,6 +502,8 @@ unsigned SystemZInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
 
   while (I != MBB.begin()) {
     --I;
+    if (I->isDebugValue())
+      continue;
     if (I->getOpcode() != SystemZ::JMP &&
         getCondFromBranchOpc(I->getOpcode()) == SystemZCC::INVALID)
       break;