Revert "cmd/compile: enable Asan check for global variables"

Revert "cmd/compile: enable Asan check for global variables"

This reverts CL 401775.

Reason for revert: broke build.

Change-Id: I4f6f2edff1e4afcf31cd90e26dacf303979eb10c
Reviewed-on: https://go-review.googlesource.com/c/go/+/403981
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>