[AIX]Emit function descriptor csect in assembly

This patch emits the function descriptor csect for functions with definitions
under both 32-bit/64-bit mode on AIX.

Differential Revision: https://reviews.llvm.org/D66724

llvm-svn: 373009
diff --git a/llvm/lib/MC/XCOFFObjectWriter.cpp b/llvm/lib/MC/XCOFFObjectWriter.cpp
index e831d3e..5d8735b 100644
--- a/llvm/lib/MC/XCOFFObjectWriter.cpp
+++ b/llvm/lib/MC/XCOFFObjectWriter.cpp
@@ -235,6 +235,9 @@
         break;
       }
       report_fatal_error("Unhandled mapping of read-write csect to section.");
+    case XCOFF::XMC_TC0:
+      // TODO FIXME Handle emiting the TOC base.
+      break;
     case XCOFF::XMC_BS:
       assert(XCOFF::XTY_CM == MCSec->getCSectType() &&
              "Mapping invalid csect. CSECT with bss storage class must be "