Implement Target ID Proposal

Changes from Konstantin Zhuravlyov, Tony Tye

Change-Id: I532801193afa9d5b8ac2a877b5497eab661f0597

runtime/hsa-runtime/libamdhsacode/amd_elf_image.cpp

@@ -706,6 +706,8 @@ namespace elf {
       uint16_t Type() override { return ehdr.e_type; }
       uint32_t EFlags() override { return ehdr.e_flags; }
       uint32_t ABIVersion() override { return (uint32_t)(ehdr.e_ident[EI_ABIVERSION]); }
+      uint32_t EClass() override { return (uint32_t)(ehdr.e_ident[EI_CLASS]); }
+      uint32_t OsAbi() override { return (uint32_t)(ehdr.e_ident[EI_OSABI]); }
 
       GElfStringTable* shstrtab() override;
       GElfStringTable* strtab() override;