[PATCH] Switch to support::endian::read/write in X86-specific JIT and RuntimeDyld.

[Alexey Samsonov]

Hi lhames,

Unaligned reads/writes is an undefined behavior, which is
properly reported by UBSan. Fix the JIT for x86 to use special routines
from Support/Endian.h, which use portable solution (memcpy) and enforce
correct endianneess.

http://reviews.llvm.org/D5011

Files:
  lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
  lib/Target/X86/X86JITInfo.cpp
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