Merge pull request !1446 from liuxiao78/master

Merge pull request !1383 from amongo/KeepPrimAttrInCNode

modify infer to get abstract value and attr value map together

support get attr in specialize

clone primitive when specialize if attribute is not the same with
infered attribute

Merge pull request !1216 from zhangdengcheng/master

Merge pull request !1426 from chengang/fix_pylint

Merge pull request !1422 from ZPaC/fix-multi-allreduce-calling-error

Merge pull request !1411 from liubuyu/master

Merge pull request !1339 from JichenZhao/layernorm_mean_var_shape

Merge pull request !1329 from ougongchang/master

add some unittest for summary operator

support ScalarSummary to record number type

Merge pull request !1348 from yihuaijie/master

Merge pull request !1320 from JichenZhao/applyrms_squaresumall_cumprod_reduceprod

Merge pull request !1331 from yoonlee666/master-deletedropout

Merge pull request !1280 from liubuyu/master

Merge pull request !1279 from gongchen/fix_custom_op_case

Merge pull request !1058 from sunsuodong/lstm_ops

be optimized as it will generate different values each time.

Merge pull request !1015 from candanzg/me_with_shape

Signed-off-by: candanzg <zhangshucheng@huawei.com>

Merge pull request !1091 from chenweifeng/cast

Merge pull request !1082 from hewei/support_cont_break

To handle 'break' and 'continue' statement, a loop context is pushed
to a stack before we parse the loop body, and pop it after body parsed.
When a 'break', 'continue' statement is encountered, we retrieve current
loop contex from the stack, and let the current block jump to the end
block or header block;

For 'break' statement, we added an extra 'end_block' follow the 'after_block',
because 'after_block' is called from a ContionalJump in 'header_block', it can
not be set as jump target from other place. to support 'break', we let loop
body jump to the 'end_block' at the 'break' point. and 'after_block'
maybe a good place to handle loop 'else' clause in the future.

Handle 'pass' is simple, just bypass it when doing parse.