Use MACRO_AT_func in entry-values.exp

MACRO_AT_func can be used in gdb.trace/entry-values.exp to correctly
get function's address in generated debug info.  As a result, the test
is more friendly to clang.  Currently, there are some fails in
entry-values.exp when the test is compiled by clang.  With this patch
applied, all fails go away.

gdb/testsuite:

2014-11-22  Yao Qi  <yao@codesourcery.com>

	* gdb.trace/entry-values.c: Remove asms.
	(foo): Add foo_label.
	(bar): Add bar_label.
	* gdb.trace/entry-values.exp: Remove code computing  foo's
	length and bar's length.
	(Dwarf::assemble): Invoke function_range for bar and use
	MACRO_AT_func for foo.

1 files changed, 2 insertions, 6 deletions

diff --git a/gdb/testsuite/gdb.trace/entry-values.c b/gdb/testsuite/gdb.trace/entry-values.c
index 11bb739..c0d561a 100644
--- a/gdb/testsuite/gdb.trace/entry-values.c
+++ b/gdb/testsuite/gdb.trace/entry-values.c
@@ -15,23 +15,19 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-asm (".section	\".text\"");
-asm (".balign 8");
-asm ("foo_start: .globl foo_start");
-
 int
 foo (int i, int j)
 {
+  asm ("foo_label: .globl foo_label");
   return 0;
 }
 
-asm ("bar_start: .globl bar_start");
-
 int
 bar (int i)
 {
   int j = 2;
 
+  asm ("bar_label: .globl bar_label");
   return foo (i, j);
 }