[interop] Share one interop header between cpyrt and the wrapper

Author: aaronj0

src/cpyrt/CallContext.h

@@ -12,40 +12,8 @@
 
 namespace cppjit::cpyrt {
 
-// small number that allows use of stack for argument passing
-const int SMALL_ARGS_N = 8;
-
-// convention to pass flag for direct calls (similar to Python's vector calls)
-#define DIRECT_CALL ((size_t)1 << (8 * sizeof(size_t) - 1))
-
-#ifndef CPYRT_PARAMETER
-#define CPYRT_PARAMETER
-// general place holder for function parameters
-struct Parameter {
-  union Value {
-    bool fBool;
-    int8_t fInt8;
-    uint8_t fUInt8;
-    short fShort;
-    unsigned short fUShort;
-    int fInt;
-    unsigned int fUInt;
-    long fLong;
-    intptr_t fIntPtr;
-    unsigned long fULong;
-    long long fLLong;
-    unsigned long long fULLong;
-    int64_t fInt64;
-    uint64_t fUInt64;
-    float fFloat;
-    double fDouble;
-    long double fLDouble;
-    void* fVoidp;
-  } fValue;
-  void* fRef;
-  char fTypeCode;
-};
-#endif // CPYRT_PARAMETER
+// Parameter and the call-ABI constants (SMALL_ARGS_N, DIRECT_CALL) come
+// from the interop callcontext.h via cppjit_interop.h
 
 // extra call information
 struct CallContext {