lib/CodeGen/CodeGenFunction.cpp

147     if (CurBB->empty() || ReturnBlock.getBlock()->use_empty()) {
148       ReturnBlock.getBlock()->replaceAllUsesWith(CurBB);
149       delete ReturnBlock.getBlock();
151       EmitBlock(ReturnBlock.getBlock());
158   if (ReturnBlock.getBlock()->hasOneUse()) {
160       dyn_cast<llvm::BranchInst>(*ReturnBlock.getBlock()->use_begin());
162         BI->getSuccessor(0) == ReturnBlock.getBlock()) {
170       delete ReturnBlock.getBlock();
179   EmitBlock(ReturnBlock.getBlock());
195     && ReturnBlock.getBlock()->use_empty();
550   ReturnBlock = getJumpDestInCurrentScope("return");