[PowerPC][AIX]Add lowering of MCSymbol MachineOperand.

Adds machine operand lowering for MCSymbolSDNodes to the PowerPC
backend. This is needed to produce call instructions in assembly for AIX
because the callee operand is a MCSymbolSDNode. The test is XFAIL'ed for
asserts due to a (valid) assertion in PEI that the AIX ABI isn't supported yet.

Differential Revision: https://reviews.llvm.org/D63738

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@367133 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/TargetLoweringObjectFileImpl.cpp

@@ -1843,6 +1843,9 @@ MCSection *TargetLoweringObjectFileXCOFF::SelectSectionForGlobal(
                                         Kind, /* BeginSymbolName */ nullptr);
   }
 
+  if (Kind.isText())
+    return TextSection;
+
   report_fatal_error("XCOFF other section types not yet implemented.");
 }