Instead of printing unnecessary basic block labels as labels in
verbose-asm mode, print comments instead. This eliminates a non-comment
difference between verbose-asm mode and non-verbose-asm mode.

Also, factor out the relevant code out of all the targets and into
target-independent code.

llvm-svn: 83392
diff --git a/llvm/lib/Target/MSP430/AsmPrinter/MSP430AsmPrinter.cpp b/llvm/lib/Target/MSP430/AsmPrinter/MSP430AsmPrinter.cpp
index b6d268d..ad40fd4 100644
--- a/llvm/lib/Target/MSP430/AsmPrinter/MSP430AsmPrinter.cpp
+++ b/llvm/lib/Target/MSP430/AsmPrinter/MSP430AsmPrinter.cpp
@@ -124,13 +124,7 @@
   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
        I != E; ++I) {
     // Print a label for the basic block.
-    if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
-      // This is an entry block or a block that's only reachable via a
-      // fallthrough edge. In non-VerboseAsm mode, don't print the label.
-    } else {
-      EmitBasicBlockStart(I);
-      O << '\n';
-    }
+    EmitBasicBlockStart(I);
 
     for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
          II != E; ++II)