Oilpan: Disable checkPointer() in non-ASan builds
Oilpan: Disable checkPointer() in non-ASan builds

It seems that the overhead is too large. This may be a cause of the increase
in the cycle time of Oilpan CQ bots.

BUG=

Review URL: https://codereview.chromium.org/1418453015

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#358927}

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