[static analyzer]: only call RemoveDeadBindings() when analyzing non-Expr stmts, entering a basic block, or analyzing non-consumed expressions.  This sigificantly speeds up analysis time, and reduces analysis time down to 27% less than before we linearized the CFG.
[static analyzer]: only call RemoveDeadBindings() when analyzing non-Expr stmts, entering a basic block, or analyzing non-consumed expressions.  This sigificantly speeds up analysis time, and reduces analysis time down to 27% less than before we linearized the CFG.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@144332 91177308-0d34-0410-b5e6-96231b3b80d8

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