Refactor the RelocVisitor::visit method

This change replaces the brittle if/else chain of string comparisons
with a switch statement on the detected target triple, removing the
need for testing arbitrary architecture names returned from
getFileFormatName, whose primary purpose seems to be for display
(user-interface) purposes. The visitor now takes a reference to the
object file, rather than its arbitrary file format name to figure out
whether the file is a 32 or 64-bit object file and what the detected
target triple is.

A set of tests have been added to help show that the refactoring processes
relocations for the same targets as the original code.

Patch by Charlie Turner.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218388 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Object/ELFObjectFile.h

@@ -924,6 +924,8 @@ unsigned ELFObjectFile<ELFT>::getArch() const {
     default:
       report_fatal_error("Invalid ELFCLASS!");
     }
+  case ELF::EM_PPC:
+    return Triple::ppc;
   case ELF::EM_PPC64:
     return IsLittleEndian ? Triple::ppc64le : Triple::ppc64;
   case ELF::EM_S390: