Disable g++ inlining of eager-tracing mark() method.

Versions of g++ (with -Os) are over-eager about inlining the mark()
method that's used for all non-mixin Oilpan objects, resulting in
a code size increase that's unwanted (for Android official builds.)
Other compilers and g++ (with -O2/-O3) are more discriminate about
inlining the method, with no comparable code size increase delta.

Tuning the compiler's optimization option set to avoid the problem
hasn't proven successful, so bluntly address the problem by disabling
inlining for the method.

R=haraken
BUG=681991

Review-Url: https://codereview.chromium.org/2643403003
Cr-Commit-Position: refs/heads/master@{#445288}
1 file changed