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Remove unnecessary creation of LexicalScope in collectDeadVariables. The created LexicialScope was only used to get isAbstractScope, which should be false from the creation: "new LexicalScope(NULL, DIDescriptor(SP), NULL, false);". We can also remove a DenseMap that holds the created LexicalScopes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193196 91177308-0d34-0410-b5e6-96231b3b80d8