Add option to get input dtype from user (#68751)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68751
Add option to get input dtype from user for AOT compilation
Test Plan:
BI model compiles and runs fine
```
(pytorch) ~/fbsource/fbcode/caffe2/fb/nnc
└─ $ buck run //caffe2/binaries:aot_model_compiler -- --model=bi.pt --model_name=pytorch_dev_bytedoc --model_version=v1 '--input_dims=1,115;1' --input_types='int64;int64'
Building... 8.3 sec (99%) 7673/7674 jobs, 0/7674 updated
WARNING: Logging before InitGoogleLogging() is written to STDERR
W1116 14:32:44.632536 1332111 TensorImpl.h:1418] Warning: Named tensors and all their associated APIs are an experimental feature and subject to change. Please do not use them for anything important until they are released as stable. (function operator())
E1116 14:32:44.673710 1332111 huge_pages_allocator.cc:287] Not using huge pages because not linked with jemalloc
The compiled llvm assembly code was saved to bi.compiled.ll
The compiled model was saved to bi.compiled.pt
```
> Error thrown when input dims and input types sizes don't match
```
(pytorch) ~/fbsource/fbcode/caffe2/fb/nnc
└─ $ buck run //caffe2/binaries:aot_model_compiler -- --model=bi.pt --model_name=pytorch_dev_bytedoc --model_version=v1 '--input_dims=1,115;1' --input_types='int64;int64;int64'
.
.
terminate called after throwing an instance of 'c10::Error'
what(): [enforce fail at aot_model_compiler.cc:208] split(';', FLAGS_input_dims).size() == split(';', FLAGS_input_types).size(). Number of input_dims and input_types should be the same
.
.
.
```
Reviewed By: ljk53
Differential Revision: D32477001
fbshipit-source-id: 8977b0b59cf78b3a2fec0c8428f83a16ad8685c5
