Remove unreachable code.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@348294 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/ELF/Arch/PPC64.cpp b/ELF/Arch/PPC64.cpp
index 747c873..259ebf7 100644
--- a/ELF/Arch/PPC64.cpp
+++ b/ELF/Arch/PPC64.cpp
@@ -741,7 +741,6 @@
   if (Type == R_PPC64_REL24)
     return isInt<26>(Offset);
   llvm_unreachable("unsupported relocation type used in branch");
-  return false;
 }
 
 RelExpr PPC64::adjustRelaxExpr(RelType Type, const uint8_t *Data,