Compiler.h: Disable initializer list usage with clang-cl
Compiler.h: Disable initializer list usage with clang-cl

Most people are using MSVC 2012, which lacks the <initializer_list>
header.  MSVC 2013 shipped with that header, but it has not yet been
tested.  If clang works with the 2013 header, then we can enable this by
checking the value of _MSC_VER.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@196448 91177308-0d34-0410-b5e6-96231b3b80d8

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