[PATCH] Fix assertion failure in coerce_unspec_val_to_type

[Tom Tromey <tromey@adacore.com>]

coerce_unspec_val_to_type does:

      set_value_address (result, value_address (val));

However, this is only valid for lval_memory.  This patch changes this
code to only set the address for lval_memory values.

This seems like an ordinary oversight in coerce_unspec_val_to_type,
and a test case would be difficult to write, so I'm submitting it
without a test case.

Tested on x86-64 Fedora 29; plus using an Ada program that exhibits
the bug (but which cannot be shared).

gdb/ChangeLog
2019-05-14  Tom Tromey  <tromey@adacore.com>

	* ada-lang.c (coerce_unspec_val_to_type): Only set address when
	value is not lval_memory.
---
 gdb/ChangeLog  | 5 +++++
 gdb/ada-lang.c | 3 ++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index dee3a83f98c..23197f60340 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -672,7 +672,8 @@ coerce_unspec_val_to_type (struct value *val, struct type *type)
       set_value_component_location (result, val);
       set_value_bitsize (result, value_bitsize (val));
       set_value_bitpos (result, value_bitpos (val));
-      set_value_address (result, value_address (val));
+      if (VALUE_LVAL (result) == lval_memory)
+	set_value_address (result, value_address (val));
       return result;
     }
 }
-- 
2.20.1