[JITLink][ELF] Log enum name of unsupported relocation type.

Logs enum name of unsupported relocation type. This also changes elf/x86 to use common util function (getELFRelocationTypeName) inside llvm object module.

Reviewed By: lhames

Differential Revision: https://reviews.llvm.org/D127715

llvm/lib/ExecutionEngine/JITLink/ELF_aarch64.cpp

@@ -107,8 +107,9 @@ private:
       return ELFLd64GOTLo12;
     }
 
-    return make_error<JITLinkError>("Unsupported aarch64 relocation:" +
-                                    formatv("{0:d}", Type));
+    return make_error<JITLinkError>(
+        "Unsupported aarch64 relocation:" + formatv("{0:d}: ", Type) +
+        object::getELFRelocationTypeName(ELF::EM_AARCH64, Type));
   }
 
   Error addRelocations() override {

llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp

@@ -471,8 +471,9 @@ private:
       return EdgeKind_riscv::R_RISCV_32_PCREL;
     }
 
-    return make_error<JITLinkError>("Unsupported riscv relocation:" +
-                                    formatv("{0:d}", Type));
+    return make_error<JITLinkError>(
+        "Unsupported riscv relocation:" + formatv("{0:d}: ", Type) +
+        object::getELFRelocationTypeName(ELF::EM_RISCV, Type));
   }
 
   Error addRelocations() override {

llvm/lib/ExecutionEngine/JITLink/ELF_x86_64.cpp

@@ -97,17 +97,6 @@ Error buildTables_ELF_x86_64(LinkGraph &G) {
 }
 } // namespace
 
-static const char *getELFX86_64RelocName(uint32_t Type) {
-  switch (Type) {
-#define ELF_RELOC(Name, Number)                                                \
-  case Number:                                                                 \
-    return #Name;
-#include "llvm/BinaryFormat/ELFRelocs/x86_64.def"
-#undef ELF_RELOC
-  }
-  return "Unrecognized ELF/x86-64 relocation type";
-}
-
 namespace llvm {
 namespace jitlink {
 
@@ -146,9 +135,9 @@ private:
     case ELF::R_X86_64_TLSGD:
       return ELF_x86_64_Edges::ELFX86RelocationKind::PCRel32TLV;
     }
-    return make_error<JITLinkError>("Unsupported x86-64 relocation type " +
-                                    formatv("{0:d}: ", Type) +
-                                    getELFX86_64RelocName(Type));
+    return make_error<JITLinkError>(
+        "Unsupported x86-64 relocation type " + formatv("{0:d}: ", Type) +
+        object::getELFRelocationTypeName(ELF::EM_X86_64, Type));
   }
 
   Error addRelocations() override {