[perf-prof] Adjust source position addresses according to ELF header size

src/perf-jit.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 73 matching lines @@
 #elif V8_TARGET_ARCH_MIPS
     return kElfMachMIPS;
 #elif V8_TARGET_ARCH_ARM64
     return kElfMachARM64;
 #else
     UNIMPLEMENTED();
     return 0;
 #endif
   }
 
+#if V8_TARGET_ARCH_32_BIT
+  static const int kElfHeaderSize = 0x34;
+#elif V8_TARGET_ARCH_64_BIT
+  static const int kElfHeaderSize = 0x40;
+#else
+#error Unknown target architecture pointer size
+#endif
+
   // Per-process singleton file. We assume that there is one main isolate;
   // to determine when it goes away, we keep reference count.
   static base::LazyRecursiveMutex file_mutex_;
   static FILE* perf_output_handle_;
   static uint64_t reference_count_;
   static void* marker_address_;
   static uint64_t code_index_;
 };
 
 #else
@@ skipping 13 matching lines @@
   void LogRecordedBuffer(AbstractCode* code, SharedFunctionInfo* shared,
                          const char* name, int length) override {
     UNIMPLEMENTED();
   }
 };
 
 #endif  // V8_OS_LINUX
 }  // namespace internal
 }  // namespace v8
 #endif