[gdb/testsuite] Fix g0 search in gdb.arch/i386-sse-stack-align.exp

When running test-case gdb.arch/i386-sse-stack-align.exp on target board
unix/-m32, I run into:
...
(gdb) print (int) g0 ()^M
Invalid data type for function to be called.^M
(gdb) FAIL: gdb.arch/i386-sse-stack-align.exp: print (int) g0 ()
...

Gdb is supposed to use minimal symbol g0:
...
$ nm i386-sse-stack-align | grep g0
08049194 t g0
...
but instead it finds a g0 symbol in the debug info of libm, specifically in
./sysdeps/ieee754/ldbl-96/e_lgammal_r.c.

Fix this by renaming g[0-4] to test_g[0-4].

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2021-01-28  Tom de Vries  <tdevries@suse.de>

	* gdb.arch/i386-sse-stack-align.S: Rename g[0-4] to test_g[0-4].
	* gdb.arch/i386-sse-stack-align.c: Same.
	* gdb.arch/i386-sse-stack-align.exp: Same.

1 files changed, 7 insertions, 6 deletions

diff --git a/gdb/testsuite/gdb.arch/i386-sse-stack-align.c b/gdb/testsuite/gdb.arch/i386-sse-stack-align.c
index adae6b7..4fd1fda 100644
--- a/gdb/testsuite/gdb.arch/i386-sse-stack-align.c
+++ b/gdb/testsuite/gdb.arch/i386-sse-stack-align.c
@@ -34,31 +34,31 @@ f (void)
 }
 
 static __attribute__((noinline, noclone)) int
-g0 (void)
+test_g0 (void)
 {
   return f ();
 }
 
 static __attribute__((noinline, noclone)) int
-g1 (int p1)
+test_g1 (int p1)
 {
   return f ();
 }
 
 static __attribute__((noinline, noclone)) int
-g2 (int p1, int p2)
+test_g2 (int p1, int p2)
 {
   return f ();
 }
 
 static __attribute__((noinline, noclone)) int
-g3 (int p1, int p2, int p3)
+test_g3 (int p1, int p2, int p3)
 {
   return f ();
 }
 
 static __attribute__((noinline, noclone)) int
-g4 (int p1, int p2, int p3, int p4)
+test_g4 (int p1, int p2, int p3, int p4)
 {
   return f ();
 }
@@ -66,5 +66,6 @@ g4 (int p1, int p2, int p3, int p4)
 int
 main (void)
 {
-  return g0 () + g1 (1) + g2 (1, 2) + g3 (1, 2, 3) + g4 (1, 2, 3, 4);
+  return (test_g0 () + test_g1 (1) + test_g2 (1, 2) + test_g3 (1, 2, 3)
+	  + test_g4 (1, 2, 3, 4);
 }