[PATCH] sysdeps/riscv/start.S: rename .Lload_gp to load_gp (bug 24376)

[Florian Weimer]

* Andreas Schwab:

> Renaming the symbol keeps the label in the symbol table as a normal local
> label, so that `objdump -d' can pick it up as an anchor.
>
> 	[BZ #24376]
> 	* sysdeps/riscv/start.S (load_gp): Rename from .Lload_gp, all uses
> 	changed.

Perhaps use startup_load_gp instead, so that it's less ambiguous in
the debugging information?