Revert "[SYCLomatic] Support more python script migration rules (#2750)" (#2756)

This reverts commit 980ac0e.

Author: zhimingwang36

clang/test/dpct/python_migration/case_006/expected.py

@@ -56,8 +56,3 @@
 
 torch.xpu.set_stream(st)
 xpu.set_stream(st)
-
-if torch.xpu.current_stream() != torch.xpu.current_stream():
-    print("Not default stream")
-device = torch.device('xpu')
-extra_cuda_cflags=['-ffast-math', '']

clang/test/dpct/python_migration/case_006/input.py

@@ -56,8 +56,3 @@
 
 torch.cuda.set_stream(st)
 cuda.set_stream(st)
-
-if torch.cuda.current_stream() != torch.cuda.default_stream():
-    print("Not default stream")
-device = torch.device('cuda')
-extra_cuda_cflags=['--use_fast_math', '--allow-unsupported-compiler']

clang/tools/dpct/extensions/python_rules/python_build_script_migration_rule_pytorch_common.yaml

@@ -247,35 +247,3 @@
   PythonSyntax: CUDA_HOME
   In: CUDA_HOME
   Out: SYCL_HOME
-
-- Rule: rule_cuda_flag_use_fast_math
-  Kind: PythonRule
-  Priority: Fallback
-  MatchMode: Partial
-  PythonSyntax: cuda_flag_use_fast_math
-  In: '--use_fast_math'
-  Out: '-ffast-math'
-
-- Rule: rule_cuda_flag_allow-unsupported-compiler
-  Kind: PythonRule
-  Priority: Fallback
-  MatchMode: Partial
-  PythonSyntax: cuda_flag_allow-unsupported-compiler
-  In: '--allow-unsupported-compiler'
-  Out: ''
-
-- Rule: rule_cuda_default_stream
-  Kind: PythonRule
-  Priority: Fallback
-  MatchMode: Full
-  PythonSyntax: cuda_default_stream
-  In: torch.cuda.default_stream
-  Out: torch.xpu.current_stream
-
-- Rule: rule_torch_device_cuda
-  Kind: PythonRule
-  Priority: Fallback
-  MatchMode: Full
-  PythonSyntax: torch_device_cuda
-  In: torch.device('cuda')
-  Out: torch.device('xpu')