[libunwind] Avoid warning about unused typedef

[the_jk]

Summary

Move the definition of Elf_Addr typedef to the only place it is used, to avoid:

In file included from /home/the_jk/source/llvm-project/libunwind/src/libunwind.cpp:21:
llvm-project/libunwind/src/AddressSpace.hpp:501:28: warning: unused typedef 'Elf_Addr' [-Wunused-local-typedef]

typedef ElfW(Addr) Elf_Addr;
                           ^

1 warning generated.

when compiling for Android with _LIBUNWIND_ARM_EHABI defined and
_LIBUNWIND_SUPPORT_DWARF_UNWIND not defined.

[compnerd]

Sure, this seems reasonable.

[the_jk]

I don't have commit access so I'd need someone to push this, thanks.

[compnerd]

SVN r372427

libunwind/src/AddressSpace.hpp

int found = dl_iterate_phdr(
         }
 
 #if !defined(Elf_Half)
         typedef ElfW(Half) Elf_Half;
 #endif
 #if !defined(Elf_Phdr)
         typedef ElfW(Phdr) Elf_Phdr;
 #endif
-#if !defined(Elf_Addr) && defined(__ANDROID__)
-        typedef ElfW(Addr) Elf_Addr;
-#endif
 
  #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
   #if !defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
    #error "_LIBUNWIND_SUPPORT_DWARF_UNWIND requires _LIBUNWIND_SUPPORT_DWARF_INDEX on this platform."
   #endif
         size_t object_length;
 #if defined(__ANDROID__)
+# if !defined(Elf_Addr)
+        typedef ElfW(Addr) Elf_Addr;
+# endif
         Elf_Addr image_base =
             pinfo->dlpi_phnum
                 ? reinterpret_cast<Elf_Addr>(pinfo->dlpi_phdr) -
                       reinterpret_cast<const Elf_Phdr *>(pinfo->dlpi_phdr)
                           ->p_offset
                 : 0;
 #endif