Create a machine basic block in the constant pool and retrieve the symbol for an MBB.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140824 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMAsmPrinter.cpp b/lib/Target/ARM/ARMAsmPrinter.cpp
index fe8a65e..f5d5248 100644
--- a/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -853,6 +853,9 @@
   } else if (ACPV->isGlobalValue()) {
     const GlobalValue *GV = ACPV->getGV();
     MCSym = GetARMGVSymbol(GV);
+  } else if (ACPV->isMachineBasicBlock()) {
+    const MachineBasicBlock *MBB = ACPV->getMBB();
+    MCSym = MBB->getSymbol();
   } else {
     assert(ACPV->isExtSymbol() && "unrecognized constant pool value");
     MCSym = GetExternalSymbolSymbol(ACPV->getSymbol());