gh-111354: Simplify _PyGen_yf by moving some of its work to the compiler and frame state

Doc/library/dis.rst

@@ -824,7 +824,8 @@ iterations of the loop.
       oparg set to be the exception block depth, for efficient closing of generators.
 
    .. versionchanged:: 3.13
-      this opcode no longer has an oparg
+      oparg is ``1`` if this instruction is part of a yield-from or await, and ``0``
+      otherwise.
 
 .. opcode:: SETUP_ANNOTATIONS
 

Doc/whatsnew/3.13.rst

@@ -948,7 +948,8 @@ Others
 CPython bytecode changes
 ========================
 
-* ``YIELD_VALUE`` no longer has an oparg. The oparg of ``RESUME`` was
+* The oparg of ``YIELD_VALUE`` is now ``1`` if the yield is part of a
+  yield-from or await, and ``0`` otherwise. The oparg of ``RESUME`` was
   changed to add a bit indicating whether the except-depth is 1, which
   is needed to optimize closing of generators.
   (Contributed by Irit Katriel in :gh:`111354`.)

Include/internal/pycore_frame.h

@@ -36,13 +36,16 @@ extern PyFrameObject* _PyFrame_New_NoTrack(PyCodeObject *code);
 /* other API */
 
 typedef enum _framestate {
-    FRAME_CREATED = -2,
-    FRAME_SUSPENDED = -1,
+    FRAME_CREATED = -3,
+    FRAME_SUSPENDED = -2,
+    FRAME_SUSPENDED_YIELD_FROM = -1,
     FRAME_EXECUTING = 0,
     FRAME_COMPLETED = 1,
     FRAME_CLEARED = 4
 } PyFrameState;
 
+#define FRAME_STATE_SUSPENDED(S) ((S) == FRAME_SUSPENDED || (S) == FRAME_SUSPENDED_YIELD_FROM)
+
 enum _frameowner {
     FRAME_OWNED_BY_THREAD = 0,
     FRAME_OWNED_BY_GENERATOR = 1,