[PATCH] -fms-extensions: Implement half of #pragma init_seg

[Reid Kleckner]

Hi rsmith, majnemer,

This pragma is very rare.  We could *hypothetically* lower some uses of
it down to @llvm.global_ctors, but given that GlobalOpt isn't able to
optimize prioritized global ctors today, there's really no point.

If we wanted to do this in the future, I would check if the section used
in the pragma started with ".CRT$XC" and had up to two characters after
it.  Those two characters could form the 16-bit initialization priority
that we support in @llvm.global_ctors.  We would have to teach LLVM to
lower prioritized global ctors on COFF as well.

This should let us compile some silly uses of this pragma in WebKit /
Blink.

http://reviews.llvm.org/D4549

Files:
  include/clang/Basic/Attr.td
  include/clang/Basic/AttrDocs.td
  include/clang/Basic/DiagnosticParseKinds.td
  include/clang/Sema/Sema.h
  lib/CodeGen/CGDeclCXX.cpp
  lib/CodeGen/CodeGenModule.h
  lib/Parse/ParsePragma.cpp
  lib/Sema/Sema.cpp
  lib/Sema/SemaAttr.cpp
  lib/Sema/SemaDecl.cpp
  test/CodeGenCXX/pragma-init_seg.cpp
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