ntdll: Export __chkstk_arm64ec().

dlls/kernel32/kernel32.spec

@@ -1670,6 +1670,7 @@
 @ stdcall -import ZombifyActCtx(ptr)
 @ stdcall -arch=arm,x86_64 -private __C_specific_handler(ptr long ptr ptr) NTDLL.__C_specific_handler
 @ cdecl -arch=arm,x86_64 -norelay __chkstk() NTDLL.__chkstk
+@ cdecl -arch=arm64ec -norelay __chkstk_arm64ec() NTDLL.__chkstk_arm64ec
 @ stub _DebugOut
 @ stub _DebugPrintf
 @ stdcall _hread(long ptr long)

dlls/ntdll/ntdll.spec

@@ -1506,6 +1506,7 @@
 @ cdecl -private -arch=i386 _CIsqrt()
 @ stdcall -arch=!i386 __C_specific_handler(ptr long ptr ptr)
 @ cdecl -arch=!i386 -norelay __chkstk()
+@ cdecl -arch=arm64ec -norelay __chkstk_arm64ec()
 @ cdecl __isascii(long)
 @ cdecl __iscsym(long)
 @ cdecl __iscsymf(long)

dlls/ntdll/signal_arm64ec.c

@@ -170,6 +170,17 @@ void __attribute__((naked)) __chkstk(void)
 }
 
 
+/**************************************************************************
+ *		__chkstk_arm64ec (NTDLL.@)
+ *
+ * Supposed to touch all the stack pages, but we shouldn't need that.
+ */
+void __attribute__((naked)) __chkstk_arm64ec(void)
+{
+    asm( "ret" );
+}
+
+
 /***********************************************************************
  *		RtlRaiseException (NTDLL.@)
  */