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This partially reverts r185202 and restores DIELabel to hold plain MCSymbol references. Instead, we add a new subclass DIEExpr of DIEValue that can hold generic MCExpr references. This is in preparation for supporting debug info for TLS variables on PowerPC, where we need to describe the variable location using a more complex expression than just MCSymbolRefExpr. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185458 91177308-0d34-0410-b5e6-96231b3b80d8
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