pythonGH-124820: Move -mno-outline-atomics flag to aarch64 Linux JI…

…T builds only (pythonGH-124821)

(cherry picked from commit 6737333)

Co-authored-by: Savannah Ostrowski <savannahostrowski@gmail.com>

Tools/jit/_targets.py

@@ -512,7 +512,12 @@ def get_target(host: str) -> _COFF | _ELF | _MachO:
         args = ["-fms-runtime-lib=dll"]
         target = _COFF(host, alignment=8, args=args)
     elif re.fullmatch(r"aarch64-.*-linux-gnu", host):
-        args = ["-fpic"]
+        args = [
+            "-fpic",
+            # On aarch64 Linux, intrinsics were being emitted and this flag
+            # was required to disable them.
+            "-mno-outline-atomics",
+        ]
         target = _ELF(host, alignment=8, args=args)
     elif re.fullmatch(r"i686-pc-windows-msvc", host):
         args = ["-DPy_NO_ENABLE_SHARED"]