gh-109649: Use os.process_cpu_count() (#110165)

Replace os.cpu_count() with os.process_cpu_count() in modules:

* compileall
* concurrent.futures
* multiprocessing

Replace os.cpu_count() with os.process_cpu_count() in programs:

* _decimal deccheck.py test
* freeze.py
* multissltests.py
* python -m test (regrtest)
* wasm_build.py

Other changes:

* test.pythoninfo logs os.process_cpu_count().
* regrtest gets os.process_cpu_count() / os.cpu_count() in headers.

1 files changed, 5 insertions, 1 deletions

diff --git a/Tools/wasm/wasm_build.py b/Tools/wasm/wasm_build.py
index 3558ecd..c0b9999 100755
--- a/Tools/wasm/wasm_build.py
+++ b/Tools/wasm/wasm_build.py
@@ -516,7 +516,11 @@ class BuildProfile:
     def getenv(self) -> Dict[str, Any]:
         """Generate environ dict for platform"""
         env = os.environ.copy()
-        env.setdefault("MAKEFLAGS", f"-j{os.cpu_count()}")
+        if hasattr(os, 'process_cpu_count'):
+            cpu_count = os.process_cpu_count()
+        else:
+            cpu_count = os.cpu_count()
+        env.setdefault("MAKEFLAGS", f"-j{cpu_count}")
         platenv = self.host.platform.getenv(self)
         for key, value in platenv.items():
             if value is None: