runtime: change the name of variables in asan-related assembly functions

runtime: change the name of variables in asan-related assembly functions

Variables in functions implemented in assembly should have the
same names as when they were defined. The names of some variables
in asan-related assembly functions do not follow the above rule,
which will cause the runtime test to fail. This CL fixes this issue.

Updates #64257

Change-Id: I261f4db807d25e460513ef1c92cd1b707cdd1a16
Reviewed-on: https://go-review.googlesource.com/c/go/+/543837
Run-TryBot: Fannie Zhang <Fannie.Zhang@arm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>