ld: Update PR ld/25237 test

1. Skip targets which don't support the .bss section alignment, 1 << 16.
2. Replace .bss with ".section .bss".
3. Use ".zero 0xb60000" for targets which pad the section to its alignment.

	PR ld/25237
	* testsuite/ld-elf/pr25237.d: Skip avr-*-* and h8300-*-*.
	Update expected segment size to 0xb60000.
	* testsuite/ld-elf/pr25237.s: Use ".section .bss" and
	".zero 0xb60000".

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>

ld/testsuite/ld-elf/pr25237.d

@@ -1,6 +1,9 @@
 #ld:
 #readelf: -l -W
+# Address bits of these targets don't support the .bss section alignment,
+# 1 << 16.
+#notarget: avr-*-* h8300-*-*
 
 #...
- +LOAD +0x0+ +0x[0-9a-f]+ +0x[0-9a-f]+ +0x0+ +0xb5dce8+ +RW +0x10000
+ +LOAD +0x0+ +0x[0-9a-f]+ +0x[0-9a-f]+ +0x0+ +0xb60000+ +RW +0x10000
 #pass

ld/testsuite/ld-elf/pr25237.s

@@ -10,10 +10,10 @@ main:
 	.globl	_main	/* Used by LynxOS targets.  */
 _main:
 	.dc.a 0
-	.bss
+	.section	.bss, "aw", %nobits
 	.p2align 16
 	.type	bss, %object
-	.size	bss, 11918568
+	.size	bss, 0xb60000
 bss:
-	.zero	11918568
+	.zero	0xb60000
 	.section	.note.GNU-stack,"",%progbits