tccgen: arm/i386: save_reg_upstack

tccgen.c:gv() when loading long long from lvalue, before
was saving all registers which caused problems in the arm
function call register parameter preparation, as with

    void foo(long long y, int x);
    int main(void)
    {
      unsigned int *xx[1], x;
      unsigned long long *yy[1], y;
      foo(**yy, **xx);
      return 0;
    }

Now only the modified register is saved if necessary,
as in this case where it is used to store the result
of the post-inc:

        long long *p, v, **pp;
        v = 1;
        p = &v;
        p[0]++;
        printf("another long long spill test : %lld\n", *p);

i386-gen.c :
- found a similar problem with TOK_UMULL caused by the
  vstack juggle in tccgen:gen_opl()
  (bug seen only when using EBX as 4th register)

1 files changed, 2 insertions, 1 deletions

diff --git a/arm-gen.c b/arm-gen.c
index cca9da5..9b6bca2 100644
--- a/arm-gen.c
+++ b/arm-gen.c
@@ -1177,7 +1177,8 @@ again:
     }
   }
 
-  /* second pass to restore registers that were saved on stack by accident */
+  /* second pass to restore registers that were saved on stack by accident.
+     Maybe redundant after the "lvalue_save" patch in tccgen.c:gv() */
   if (++pass < 2)
     goto again;