Alternative fix for "Incorrect function call code on ARMv6"

"make test" crashes without that "save_regs()".

This partially reverts
commit 49d3118621.

Found another solution:  In a 2nd pass Just look if
any of the argument registers has been saved again,
and restore if so.

tccgen.c

@@ -861,6 +861,11 @@ ST_FUNC int gv(int rc)
 #endif
                 if (r >= VT_CONST || /* XXX: test to VT_CONST incorrect ? */
                            (vtop->r & VT_LVAL)) {
+                    /* We do not want to modifier the long long
+                       pointer here, so the safest (and less
+                       efficient) is to save all the other registers
+                       in the stack. XXX: totally inefficient. */
+                    save_regs(1);
                     /* load from memory */
                     vtop->type.t = load_type;
                     load(r, vtop);