Halve size of WASI stack

Author: markshannon

Lib/test/test_functools.py

@@ -2077,10 +2077,7 @@ def fib(n):
                 return n
             return fib(n-1) + fib(n-2)
 
-        try:
-            fib(100)
-        except RecursionError:
-            fib(50)
+        fib(100)
         if self.module == c_functools:
             fib.cache_clear()
             with support.infinite_recursion():

Python/ceval.c

@@ -332,8 +332,7 @@ _Py_EnterRecursiveCallUnchecked(PyThreadState *tstate)
    // test_descr crashed on sparc64 with >7000 but let's keep a margin of error.
 #  define Py_C_STACK_SIZE 1600000
 #elif defined(__wasi__)
-   // Based on wasmtime 16.
-#  define Py_C_STACK_SIZE 2000000
+#  define Py_C_STACK_SIZE 1000000
 #elif defined(__hppa__) || defined(__powerpc64__)
    // test_descr crashed with >8000 but let's keep a margin of error.
 #  define Py_C_STACK_SIZE 2000000