From: @wilfchen
Reviewed-by: @cristoval,@limingqi107
Signed-off-by: @limingqi107

This reverts commit 3be79efd808f54b6e66fa45f26e601e5a143ae76, reversing
changes made to cf4479756a.

This reverts commit a2f50fb7db2fe1ae588b11e08fc51fe2398114ef, reversing
changes made to 4735ec3296.

From: @liangzelang
Reviewed-by: @zhoufeng54,@kisnwang
Signed-off-by: @kisnwang

1. fix the tainted variable 'path'
2. capitalize constants in env_config_parser
3. move constants about attribute to common utils.h

From: @liangzelang
Reviewed-by: @kisnwang,@jjfeing
Signed-off-by: @jjfeing

From: @kisnwang
Reviewed-by: @zhoufeng54,@jjfeing
Signed-off-by: @jjfeing

From: @zh_qh
Reviewed-by: 
Signed-off-by:

Move auto monad eliminator out from CSE.
Eliminate auto monad nodes for output node.

From: @liu_xiao_93
Reviewed-by: @liangchenghui,@wuxuejian
Signed-off-by: @liangchenghui

From: @fangzehua
Reviewed-by: 
Signed-off-by:

From: @liu_xiao_93
Reviewed-by: @liangchenghui
Signed-off-by: @liangchenghui

From: @liubuyu
Reviewed-by: 
Signed-off-by:

From: @tronzhang
Reviewed-by: 
Signed-off-by:

From: @HulkTang
Reviewed-by: @zhoufeng54,@chujinjin
Signed-off-by: @chujinjin

From: @liubuyu
Reviewed-by: @zhoufeng54,@kisnwang
Signed-off-by: @kisnwang

1. Remove output parameter pool for ascend control flow;
2. Remove duplicate code for Switch and SwitchLayer;
3. Add 'return' attribute to label_goto that used for return;
4. Disable tail call optimize for graphs with 'recursive' flag.

From: @liangzhibo
Reviewed-by: @kingxian,@jpc_chenjianping
Signed-off-by: @kingxian

From: @jojobugfree
Reviewed-by: 
Signed-off-by:

From: @yuchaojie
Reviewed-by: @kisnwang
Signed-off-by:

From: @liubuyu
Reviewed-by: 
Signed-off-by: