[PATCH] Fix ARM EHABI when function has landingpad and nounwind.

[Logan Chien]

Hi asl,

If the function has the landingpad instruction, then the
handlerdata should be emitted even if the function has
nouwnind attribute.  Otherwise, following code will not
work:

void test1() noexcept {
  try {
    throw_exception();
  } catch (...) {
  }
}

http://reviews.llvm.org/D3748

Files:
  lib/CodeGen/AsmPrinter/ARMException.cpp
  test/CodeGen/ARM/ehabi-handlerdata-nounwind.ll
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