[LLDB] Fix potential nullptr deref #11959
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lldb/source/Plugins/ExpressionParser/Swift/SwiftUserExpression.cpp
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The previous code would only early exit if *both* pointers are null and crash if the SymbolContext only had a function. rdar://164547628
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The previous code would only early exit if both pointers are null and crash if the SymbolContext only had a function.
rdar://164547628