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With the new setup with InlinedGlobalTracingVisitor, trace() functions are
overloaded and may be called from a traceImpl() function in derived classes.
As traceImpl() is a function template, the trace() overload cannot be resolved
at the time of plugin execution and thus the callee of the trace() call becomes
UnresolvedMemberExpr*.

This patch adds support for detecting Base::trace() call if the
"Base::trace" part is UnresolvedMemberExpr. Specifically, the new code finds
a function looking like trace() from the candidates of UnresolvedMemberExpr,
and if there's one, we treat it as a valid Base::trace() call. The call
needs to give exactly one argument named "visitor" to the function.

A few tests are added to test these cases. A stub for InlinedGlobalTracing-
Visitor is added to tests/heap/stubs.h so it can be used from tests.

BUG=none
R=kouhei@chromium.org
CC=zerny@chromium.org, oilpan-reviews@chromium.org

Review URL: https://codereview.chromium.org/939303005

Cr-Commit-Position: refs/heads/master@{#317768}