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RuntimeDyld symbol info previously consisted of just a Section/Offset pair. This patch replaces that pair type with a SymbolInfo class that also tracks symbol visibility. A new method, RuntimeDyld::getExportedSymbolLoadAddress, is introduced which only returns a non-zero result for exported symbols. For non-exported or non-existant symbols this method will return zero. The RuntimeDyld::getSymbolAddress method retains its current behavior, returning non-zero results for all symbols regardless of visibility. No in-tree clients of RuntimeDyld are changed. The newly introduced functionality will be used by the Orc APIs. No test case: Since this patch doesn't modify the behavior for any in-tree clients we don't have a good tool to test this with yet. Once Orc is in we can use it to write regression tests that test these changes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226341 91177308-0d34-0410-b5e6-96231b3b80d8
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