* [PASS] Enhance LiftAttrScope

* update vt

* Support vector operations for AMD (llvm IR)

* fix whitespace

* update comments, docstring

* inline AMD GPU functions

* feat(docs) add how_to for tvm install with nnpack support

* feat(docs) change python package paragraph

* feat(doc) remove unsure sentence

* add comments on nnpack usage vs TVM

* remove mxnet nnpack tips for nthread change

* Support vector operations for AMD (llvm IR)

* fix whitespace

* update comments, docstring

Change minimum 32-bit restriction for floating point types to 8-bit.
This change is to enable reduced precision types that may use vector operations underneath the hood (cases #lanes > 1 such as half4).

* enable popcount intrin

* fix lint

* add test

* fix python3

* removed fma dispatch

* added comments to explain why remove fma

* fix lint

* use fmuladd intrin for fma dispatch

* view llvm ir and gcn asm with module.get_source(...)

* fix lint

* [BUFFER] Smarter slice to detect compactness

* move simplify of begins early

* update topi/cuda schedules to use target.max_num_threads

* allow num_thread to be larger than cuda.max_num_threads

* remove get_max_num_threads and make it inline

* add friendly tips when not found cl and link

* fix lint

* added math function support

* bug fix extern func call in llvm based codegen

lint fix

fix build

bug fix extern func call in llvm based codegen

* moved rocm bitcodes detection to python

use `object.__eq__`(default object identity comparison) as default
implementation of same_as. This should be OK since `EqualOp` and
`NotEqualOp` are pure Python object, `object.__eq__` is sufficient.

* [PYTHON] Improve equal sugar

* fix comment

* [ARITH] More caninical simplfy

* [DEBUG] Use HalideIR with trace logging

* [FIX] Fix target warning

* [FIX] Deduplicate options

* Fix

* Fix

* [CODEGEN] Allow link additional module

* fix py3

* add register back

* [CODEGEN] Force not inline compute core for better debug

* also support llvm4

* [TVM] Introduce target generic dispatch system

* fix target warning