[ELF] Delete R_PPC64_CALL_PLT from isRelExpr()

It was added by D46654 but is actually never used.
R_PPC64_CALL_PLT (was: R_PPC_CALL_PLT) is a static link-time constant.

Reviewed By: ruiu

Differential Revision: https://reviews.llvm.org/D62994

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@362788 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/ELF/Relocations.cpp b/ELF/Relocations.cpp
index d3cc608..68055bf 100644
--- a/ELF/Relocations.cpp
+++ b/ELF/Relocations.cpp
@@ -379,8 +379,7 @@
 // file (PC, or GOT for example).
 static bool isRelExpr(RelExpr Expr) {
   return oneof<R_PC, R_GOTREL, R_GOTPLTREL, R_MIPS_GOTREL, R_PPC64_CALL,
-               R_PPC64_CALL_PLT, R_PPC64_RELAX_TOC, R_AARCH64_PAGE_PC,
-               R_RELAX_GOT_PC>(Expr);
+               R_PPC64_RELAX_TOC, R_AARCH64_PAGE_PC, R_RELAX_GOT_PC>(Expr);
 }
 
 // Returns true if a given relocation can be computed at link-time.