Merge AutoUpgrade of EH magic variable.
    
    $ svn merge -c 113600 https://llvm.org/svn/llvm-project/llvm/trunk
    --- Merging r113600 into '.':
    A    test/Bitcode/AutoUpgradeGlobals.ll
    A    test/Bitcode/AutoUpgradeGlobals.ll.bc
    U    include/llvm/AutoUpgrade.h
    U    lib/Bitcode/Reader/BitcodeReader.cpp
    U    lib/VMCore/AutoUpgrade.cpp
    $ svn merge -c 113603 https://llvm.org/svn/llvm-project/llvm/trunk
    --- Merging r113603 into '.':
    G    lib/VMCore/AutoUpgrade.cpp
    $ svn merge -c 113615 https://llvm.org/svn/llvm-project/llvm/trunk
    --- Merging r113615 into '.':
    G    lib/VMCore/AutoUpgrade.cpp
    
    llvm-svn: 114020