gh-129244: Remove workaround for MSVC compiler crash (#129263)

* Remove compiler workaround

* Remote _Py_USING_PGO

Author: mdboom

PCbuild/pyproject.props

@@ -53,7 +53,6 @@
     <ClCompile>
       <AdditionalIncludeDirectories>$(PySourcePath)Include;$(PySourcePath)Include\internal;$(PySourcePath)Include\internal\mimalloc;$(GeneratedPyConfigDir);$(PySourcePath)PC;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>WIN32;$(_Py3NamePreprocessorDefinition);$(_PlatformPreprocessorDefinition)$(_DebugPreprocessorDefinition)$(_PyStatsPreprocessorDefinition)$(_PydPreprocessorDefinition)%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <PreprocessorDefinitions Condition="'$(SupportPGO)' and ($(Configuration) == 'PGInstrument' or $(Configuration) == 'PGUpdate')">_Py_USING_PGO=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
 
       <Optimization>MaxSpeed</Optimization>
       <IntrinsicFunctions>true</IntrinsicFunctions>

Python/ceval.c

@@ -766,23 +766,6 @@ _PyObjectArray_Free(PyObject **array, PyObject **scratch)
 #define PY_EVAL_C_STACK_UNITS 2
 
 
-/* _PyEval_EvalFrameDefault is too large to optimize for speed with PGO on MSVC
-   when the JIT is enabled or GIL is disabled. Disable that optimization around
-   this function only. If this is fixed upstream, we should gate this on the
-   version of MSVC.
- */
-#if (defined(_MSC_VER) && \
-     defined(_Py_USING_PGO) && \
-     (defined(_Py_JIT) || \
-      defined(Py_GIL_DISABLED)))
-#define DO_NOT_OPTIMIZE_INTERP_LOOP
-#endif
-
-#ifdef DO_NOT_OPTIMIZE_INTERP_LOOP
-#  pragma optimize("t", off)
-/* This setting is reversed below following _PyEval_EvalFrameDefault */
-#endif
-
 PyObject* _Py_HOT_FUNCTION
 _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int throwflag)
 {
@@ -1171,10 +1154,6 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
 
 }
 
-#ifdef DO_NOT_OPTIMIZE_INTERP_LOOP
-#  pragma optimize("", on)
-#endif
-
 #if defined(__GNUC__)
 #  pragma GCC diagnostic pop
 #elif defined(_MSC_VER) /* MS_WINDOWS */