initial draft of PPCMachObjectWriter.cpp

this records relocation entries in the mach-o object file
for PIC code generation.
tested on powerpc-darwin8, validated against darwin otool -rvV

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188004 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Object/MachOFormat.h

@@ -425,6 +425,25 @@ namespace macho {
 
   };
 
+  /// PPC relocation types from <mach-o/ppc/reloc.h>
+  enum RelocationInfoTypePPC {
+    RIT_PPC_BR14 = RIT_Pair +1,
+    RIT_PPC_BR24,
+    RIT_PPC_HI16,
+    RIT_PPC_LO16,
+    RIT_PPC_HA16,
+    RIT_PPC_LO14,
+    RIT_PPC_SECTDIFF,
+    RIT_PPC_PB_LA_PTR,
+    RIT_PPC_HI16_SECTDIFF,
+    RIT_PPC_LO16_SECTDIFF,
+    RIT_PPC_HA16_SECTDIFF,
+    RIT_PPC_JBSR,
+    RIT_PPC_LO14_SECTDIFF,
+    RIT_PPC_LOCAL_SECTDIFF,
+    RIT_PPC_TLV
+  };
+
 } // end namespace macho
 
 } // end namespace object