fix a nasty bug where we were not treating available_externally
symbols as declarations in the X86 backend.  This would manifest
on darwin x86-32 as errors like this with -fvisibility=hidden:

symbol '__ZNSbIcED1Ev' can not be undefined in a subtraction expression

This fixes PR7353.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105954 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed