Problem with operand handling

[Richard Kenner]

When I work around the problem with lcm.c, I then get:

../../xgcc -B../../ -c -g -O2      -W -Wall -gnatpg  g-exctra.adb -o g-exctra.o
+===========================GNAT BUG DETECTED==============================+
| 5.03h (20040831) (x86_64-unknown-linux-gnu) GCC error:                   |
| in var_ann, at tree-flow-inline.h:38                                     |

Upon investigating, I find I don't understand something about tree-ssa-operands.

It looks like add_stmt_operand is supposed to be passed a pointer to the
operand.  But in a number of places in tree-ssa-operands.c, you have

	tree var = referenced_var (i);

	add_stmt_operand (&var, ...);

But this puts a pointer into the stack of that function into the operands
of the statement.  That looks very wrong and seems to be causing my problem.
How is that supposed to work?