[RuntimeDyld] Teach RuntimeDyldMachO how to handle scattered VANILLA relocs on

i386.

This fixes two more MCJIT regression tests on i386:

  ExecutionEngine/MCJIT/2003-05-06-LivenessClobber.ll
  ExecutionEngine/MCJIT/2013-04-04-RelocAddend.ll

The implementation of processScatteredVANILLA is tasteless (*ba-dum-ching*),
but I'm working on a substantial tidy-up of RuntimeDyldMachO that should
improve things.

This patch also fixes a type-o in RuntimeDyldMachO::processSECTDIFFRelocation,
and teaches that method to skip over the PAIR reloc following the SECTDIFF.

<rdar://problem/16961886>



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209478 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h

@@ -71,6 +71,12 @@ private:
                                              ObjectImage &ObjImg,
                                              ObjSectionToIDMap &ObjSectionToID);
 
+  relocation_iterator processI386ScatteredVANILLA(
+					     unsigned SectionID,
+					     relocation_iterator RelI,
+					     ObjectImage &ObjImg,
+					     ObjSectionToIDMap &ObjSectionToID);
+
   struct EHFrameRelatedSections {
     EHFrameRelatedSections()
         : EHFrameSID(RTDYLD_INVALID_SECTION_ID),