Comment 10 for bug 1270789

There is a rgression with this patch in qemu aarch64-none-linux-gnu for pr38151.c.

pr38151.c:(.text+0x10c): relocation truncated to fit:
R_AARCH64_LDST64_ABS_LO12_NC against `.rodata'
collect2: error: ld returned 1 exit status

asm diff is as shown below.

< add x0, x0, :lo12:.LANCHOR0
< ldr x0, [x0]
---
> ldr x0, [x0,#:lo12:.LANCHOR0]

If I however increase the alignment of .rodata where .LANCHOR0 is
defined, this passes. Is alignment of BITS_PER_UNIT valid for
SYMBOL_REF? If I change it as I am doing this attached patch, is there
anything else I need to do. Any tips?