Fixing nimRawSetJmp for vcc and clangcl on Windows (#19959)

* fix vcc rawsetjmp

* changing `_longjmp()` to `longjmp()` and

`_setjmp()` to `setjmp()`

* fix

* fix setjmp to clangcl on Windows

* fix genTrySetjmp() to clangcl on Windows

compiler/ccgstmts.nim

@@ -1367,6 +1367,11 @@ proc genTrySetjmp(p: BProc, t: PNode, d: var TLoc) =
       linefmt(p, cpsStmts, "$1.status = __builtin_setjmp($1.context);$n", [safePoint])
     elif isDefined(p.config, "nimRawSetjmp"):
       if isDefined(p.config, "mswindows"):
+        if isDefined(p.config, "vcc") or isDefined(p.config, "clangcl"):
+          # For the vcc compiler, use `setjmp()` with one argument.
+          # See https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/setjmp?view=msvc-170
+          linefmt(p, cpsStmts, "$1.status = setjmp($1.context);$n", [safePoint])        
+        else:
           # The Windows `_setjmp()` takes two arguments, with the second being an
           # undocumented buffer used by the SEH mechanism for stack unwinding.
           # Mingw-w64 has been trying to get it right for years, but it's still

lib/system/ansi_c.nim

@@ -118,10 +118,14 @@ elif defined(nimBuiltinSetjmp):
     c_builtin_setjmp(unsafeAddr jmpb[0])
 
 elif defined(nimRawSetjmp) and not defined(nimStdSetjmp):
-  when defined(windows) and not defined(vcc):
+  when defined(windows):
     # No `_longjmp()` on Windows.
     proc c_longjmp*(jmpb: C_JmpBuf, retval: cint) {.
       header: "<setjmp.h>", importc: "longjmp".}
+    when defined(vcc) or defined(clangcl):
+      proc c_setjmp*(jmpb: C_JmpBuf): cint {.
+        header: "<setjmp.h>", importc: "setjmp".}
+    else:
       # The Windows `_setjmp()` takes two arguments, with the second being an
       # undocumented buffer used by the SEH mechanism for stack unwinding.
       # Mingw-w64 has been trying to get it right for years, but it's still