[clang][dataflow] Include terminator statements in buildStmtToBasicBlockMap

[sgatev]

Summary

This will be necessary later when we add support for evaluating logic
expressions such as && and ||.

This is part of the implementation of the dataflow analysis framework.
See "[RFC] A dataflow analysis framework for Clang AST" on cfe-dev.

clang/lib/Analysis/FlowSensitive/ControlFlowContext.cpp

for (const CFGBlock *Block : Cfg) {
 
     for (const CFGElement &Element : *Block) {
       auto Stmt = Element.getAs<CFGStmt>();
       if (!Stmt.hasValue())
         continue;
 
       StmtToBlock[Stmt.getValue().getStmt()] = Block;
     }
+    if (const Stmt *TerminatorStmt = Block->getTerminatorStmt())
+      StmtToBlock[TerminatorStmt] = Block;
   }
   return StmtToBlock;
 }
 
 llvm::Expected<ControlFlowContext>
 ControlFlowContext::build(const Decl *D, Stmt *S, ASTContext *C) {
   CFG::BuildOptions Options;
   Options.PruneTriviallyFalseEdges = false;