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gh-91502: Add a new API to check if a frame is an entry frame (GH-91503)

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`@@ -19,6 +19,16 @@ PyAPI_FUNC(PyFrameObject ) PyFrame_New(PyThreadState , PyCodeObject *,`
`19`	`19`
`20`	`20`	`PyAPI_FUNC(void)PyFrame_LocalsToFast(PyFrameObject*,int);`
`21`	`21`
	`22`	`+/* -- Caveat emptor --`
	`23`	`+ * The concept of entry frames is an implementation detail of the CPython`
	`24`	`+ * interpreter. This API is considered unstable and is provided for the`
	`25`	`+ * convenience of debuggers, profilers and state-inspecting tools. Notice that`
	`26`	`+ * this API can be changed in future minor versions if the underlying frame`
	`27`	`+ * mechanism change or the concept of an 'entry frame' or its semantics becomes`
	`28`	`+ * obsolete or outdated. */`
	`29`	`+`
	`30`	`+PyAPI_FUNC(int)_PyFrame_IsEntryFrame(PyFrameObject*frame);`
	`31`	`+`
`22`	`32`	`PyAPI_FUNC(int)PyFrame_FastToLocalsWithError(PyFrameObject*f);`
`23`	`33`	`PyAPI_FUNC(void)PyFrame_FastToLocals(PyFrameObject*);`
`24`	`34`

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`@@ -0,0 +1,2 @@`
	`1`	+Add a new:c:func:`_PyFrame_IsEntryFrame` API function, to check if a
	`2`	+:c:type:`PyFrameObject` is an entry frame. Patch by Pablo Galindo.

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`@@ -1104,6 +1104,14 @@ PyFrame_LocalsToFast(PyFrameObject *f, int clear)`
`1104`	`1104`	`}`
`1105`	`1105`	`}`
`1106`	`1106`
	`1107`	`+`
	`1108`	`+int_PyFrame_IsEntryFrame(PyFrameObject*frame)`
	`1109`	`+{`
	`1110`	`+assert(frame!=NULL);`
	`1111`	`+returnframe->f_frame->is_entry;`
	`1112`	`+}`
	`1113`	`+`
	`1114`	`+`
`1107`	`1115`	`PyCodeObject*`
`1108`	`1116`	`PyFrame_GetCode(PyFrameObject*frame)`
`1109`	`1117`	`{`

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