First cut of PowerPC(64) support in LLDB.

Summary:
This adds preliminary support for PowerPC/PowerPC64, for FreeBSD.  There are
some issues still:

 * Breakpoints don't work well on powerpc64.
 * Shared libraries don't yet get loaded for a 32-bit process on powerpc64 host.
 * Backtraces don't work.  This is due to PowerPC ABI using a backchain pointer
   in memory, instead of a dedicated frame pointer register for the backchain.
 * Breakpoints on functions without debug info may not work correctly for 32-bit
   powerpc.

Reviewers: emaste, tfiala, jingham, clayborg

Reviewed By: clayborg

Subscribers: emaste, lldb-commits

Differential Revision: http://reviews.llvm.org/D5988

llvm-svn: 220944

lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp

@@ -1724,6 +1724,7 @@ ObjectFileELF::ParseSymbols (Symtab *symtab,
     static ConstString rodata1_section_name(".rodata1");
     static ConstString data2_section_name(".data1");
     static ConstString bss_section_name(".bss");
+    static ConstString opd_section_name(".opd");    // For ppc64
 
     //StreamFile strm(stdout, false);
     unsigned i;