From: @zhangzhaoju
Reviewed-by: @zh_qh,@ginfung
Signed-off-by: @zh_qh

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

Refactor the original "PassManager" class, and derive the "GraphKernelPassManager"
GraphKernel's ir files are dumped into a new sub-directory "graph_kernel" in the original "verbose_ir_files"

All GraphKernel's passes are divided into 3 levels, and controlled by the flag "opt_level" by default.
when the opt_level is greaterequal to the pass's level, this pass will run.
The default "opt_level" is 2 when GraphKernel is enabled.
Levels:
  1. Basic features, like cluster, splitter, and some preprocess, postprocess.
  2. All stable features, mainly includes the optimization passes.
  3. Experimental features, like stitch-fusion, parallel-fusion.

The two flags "enable_pass" and "disable_pass" are available in this commit.
User can manually enable some passes when it's disabled by "opt_level", or disable the enabled passes,
by specifying that pass in this format: "stage_id.pass_id" or "stage_name.pass_name", multiple passes are separated by comma(",")
the stage/pass index and stage/pass name can be found from the ir filename.
e.g.   "--enable_pass=cluster.graph_kernel_expander,1.1,1.2"

Others:
  1. the pass "tensor_promotion" is not useful, remove it.
  2. put the pass "InsertPadOps" before "ArithmeticSimplify".

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

From: @wangnan39
Reviewed-by: @ginfung,@liangchenghui
Signed-off-by: @liangchenghui

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

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

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

Signed-off-by: zhoufeng <zhoufeng54@huawei.com>

From: @jianghui58
Reviewed-by: @zhoufeng54,@jpc_chenjianping
Signed-off-by: @jpc_chenjianping

From: @zh_qh
Reviewed-by: @ginfung,@hwhewei
Signed-off-by: @hwhewei

From: @dayschan
Reviewed-by: @gaoxiong1,@ckey_dou
Signed-off-by: @ckey_dou

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

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

From: @r1chardf1d0
Reviewed-by: @gaoxiong1,@ckey_dou
Signed-off-by: @ckey_dou

Signed-off-by: zhoufeng <zhoufeng54@huawei.com>

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

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

From: @yepei6
Reviewed-by: 
Signed-off-by:

From: @dayschan
Reviewed-by: @gaoxiong1,@gaoxiong1,@anyrenwei
Signed-off-by: @anyrenwei

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

From: @yepei6
Reviewed-by: @kingxian,@kisnwang
Signed-off-by: @kingxian

From: @lingyunli63
Reviewed-by: 
Signed-off-by: