ATRONIX: Fix: Restore Saved_State/Halt_State when a longjmp happens

Fixes: Oldes/Rebol-issues#2190

Illustrated by:
```
attempt [; this sets Saved_State
	catch/quit [ ;this calls Try_Block_Halt and sets Halt_State
		print x ; this causes an error, and calls
			;"longjmp(*State_State)", which invalidates
			; Halt_State above.
	]
]
load %./ ;Just tries to fill up the C stack and messes up "Halt_State".
halt ; Jumps to the invalid "Halt_State", and crashes
```
or
```
catch/quit [ ;sets Halt_State
    attempt [ ;sets Saved_State
        quit ; jumps to Halt_State, and invalidates "Saved_State"
    ]
]
print x ; Causes a jump to the invalid "Saved_State"
```
(cherry picked from commit 91b4fbd)

Author: zsx

src/core/c-do.c

@@ -1082,9 +1082,12 @@ x*/	static REBINT Do_Args_Light(REBVAL *func, REBVAL *path, REBSER *block, REBCN
 {
 	REBOL_STATE state;
 	REBVAL *tos;
+	jmp_buf *Last_Halt_State = Halt_State;
 
 	PUSH_STATE(state, Saved_State);
 	if (SET_JUMP(state)) {
+		/* Halt_State might become invalid, restore the one above */
+		Halt_State = Last_Halt_State;
 		POP_STATE(state, Saved_State);
 		Catch_Error(DS_NEXT); // Stores error value here
 		return TRUE;
@@ -1662,6 +1665,7 @@ x*/	static REBINT Do_Args_Light(REBVAL *func, REBVAL *path, REBSER *block, REBCN
 {
 	REBOL_STATE state;
 	REBVAL *val;
+	jmp_buf *Last_Saved_State = Saved_State;
 //	static D = 0;
 //	int depth = D++;
 
@@ -1670,6 +1674,8 @@ x*/	static REBINT Do_Args_Light(REBVAL *func, REBVAL *path, REBSER *block, REBCN
 	PUSH_STATE(state, Halt_State);
 	if (SET_JUMP(state)) {
 //		Debug_Fmt("Throw Halt %d", depth);
+		/* Saved_State might become invalid, restore the one above */
+		Saved_State = Last_Saved_State;
 		POP_STATE(state, Halt_State);
 		Catch_Error(DS_NEXT); // Stores error value here
 		return TRUE;

src/tests/units/crash-test.r3

@@ -8,7 +8,7 @@ Rebol [
 
 ~~~start-file~~~ "Crash tests"
 
-===start-group=== "Series crashes"
+===start-group=== "Crashing issues"
 
 --test-- "DH keys generation"
 	;@@ situation fixed in: https://github.com/zsx/r3/commit/cc625bebcb6038b9282876954f929c9d80048d2b
@@ -28,6 +28,11 @@ Rebol [
 	a: func [/b] [1]
 	--assert error? try [a/b/%] ;- no crash, just error!
 
+--test-- "issue-2190"
+	;@@ https://github.com/Oldes/Rebol-issues/issues/2190
+	catch/quit [ attempt [ quit ] ]
+	--assert error? try [print x] ;- no crash, just error!
+
 ===end-group===
 
 ~~~end-file~~~