Revert of [gn] Don't use PIE for host executables (patchset #2 id:20001 of https://codereview.chromium.org/2179303003/ )

Reason for revert:
Breaks roll: https://codereview.chromium.org/2182043004/

Original issue's description:
> [gn] Don't use PIE for host executables
>
> Using PIE switches on ASLR. With mksnapshot, this can lead
> to non-deterministic snapshots.
>
> BUG=v8:5233
>
> Committed: https://crrev.com/4ca39b53245619d94a80a93939613774e68e4649
> Cr-Commit-Position: refs/heads/master@{#38084}

TBR=jochen@chromium.org,vogelheim@chromium.org,yangguo@chromium.org,machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5233

Review-Url: https://codereview.chromium.org/2187613003
Cr-Commit-Position: refs/heads/master@{#38092}