[Bug gas/30944] New: LoongArch linker relaxation support in GAS breaks .balign

[icenowy at aosc dot io]

https://sourceware.org/bugzilla/show_bug.cgi?id=30944

            Bug ID: 30944
           Summary: LoongArch linker relaxation support in GAS breaks
                    .balign
           Product: binutils
           Version: 2.41
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: icenowy at aosc dot io
  Target Milestone: ---

The following assembly code:

```
.text
.balign 256
func1:
la.global $a0,exit
nop
nop
nop

.balign 256
func2:
la.global $a0,exit
nop
nop
nop
```

Surely we expect func1 @ 0x0 and func2 @ 0x100, however when assembled with no
extra options with GAS 2.41, func1 is @ 0xfc and func2 0x20c.

Add `-mno-relax` option to GAS could workaround this.

This leads to miscompilation of
https://github.com/NVIDIA/libglvnd/blob/master/src/GLdispatch/vnd-glapi/entry_loongarch64_tsd.c
(which emits thousands of function thunks .baligned to 256B, and referenced by
the index at runtime), and leads to broken GL and thus broken desktop.

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