[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.

gdb/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+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.
+
 2021-01-28  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* lib/gdb.exp (default_gdb_init): Unset XDG_CONFIG_HOME.

gdb/testsuite/gdb.arch/i386-sse-stack-align.S

@@ -70,8 +70,8 @@ f:
 	.cfi_endproc
 .LFE1:
 	.size	f, .-f
-	.type	g0, @function
-g0:
+	.type	test_g0, @function
+test_g0:
 .LFB2:
 	.cfi_startproc
 	pushl	%ebp
@@ -87,9 +87,9 @@ g0:
 	ret
 	.cfi_endproc
 .LFE2:
-	.size	g0, .-g0
-	.type	g1, @function
-g1:
+	.size	test_g0, .-test_g0
+	.type	test_g1, @function
+test_g1:
 .LFB3:
 	.cfi_startproc
 	pushl	%ebp
@@ -105,9 +105,9 @@ g1:
 	ret
 	.cfi_endproc
 .LFE3:
-	.size	g1, .-g1
-	.type	g2, @function
-g2:
+	.size	test_g1, .-test_g1
+	.type	test_g2, @function
+test_g2:
 .LFB4:
 	.cfi_startproc
 	pushl	%ebp
@@ -123,9 +123,9 @@ g2:
 	ret
 	.cfi_endproc
 .LFE4:
-	.size	g2, .-g2
-	.type	g3, @function
-g3:
+	.size	test_g2, .-test_g2
+	.type	test_g3, @function
+test_g3:
 .LFB5:
 	.cfi_startproc
 	pushl	%ebp
@@ -141,9 +141,9 @@ g3:
 	ret
 	.cfi_endproc
 .LFE5:
-	.size	g3, .-g3
-	.type	g4, @function
-g4:
+	.size	test_g3, .-test_g3
+	.type	test_g4, @function
+test_g4:
 .LFB6:
 	.cfi_startproc
 	pushl	%ebp
@@ -159,7 +159,7 @@ g4:
 	ret
 	.cfi_endproc
 .LFE6:
-	.size	g4, .-g4
+	.size	test_g4, .-test_g4
 	.globl	main
 	.type	main, @function
 main:
@@ -174,25 +174,25 @@ main:
 	andl	$-16, %esp
 	subl	$16, %esp
 	.cfi_offset 3, -12
-	call	g0
+	call	test_g0
 	movl	%eax, %ebx
 	movl	$1, (%esp)
-	call	g1
+	call	test_g1
 	addl	%eax, %ebx
 	movl	$2, 4(%esp)
 	movl	$1, (%esp)
-	call	g2
+	call	test_g2
 	addl	%eax, %ebx
 	movl	$3, 8(%esp)
 	movl	$2, 4(%esp)
 	movl	$1, (%esp)
-	call	g3
+	call	test_g3
 	addl	%eax, %ebx
 	movl	$4, 12(%esp)
 	movl	$3, 8(%esp)
 	movl	$2, 4(%esp)
 	movl	$1, (%esp)
-	call	g4
+	call	test_g4
 	addl	%ebx, %eax
 	movl	-4(%ebp), %ebx
 	leave

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);
 }

gdb/testsuite/gdb.arch/i386-sse-stack-align.exp

@@ -43,7 +43,7 @@ if ![runto_main] then {
 
 set args ""
 foreach i {0 1 2 3 4} {
-    set test "print (int) g$i ($args)"
+    set test "print (int) test_g$i ($args)"
     gdb_test_multiple $test $test {
 	-re " = 2\r\n$gdb_prompt $" {
 	    pass $test