This CL introduces StoreICTFStub and StoreICTrampolineTFStub and a switch
to enable them instead of respective platform stubs.

This should ease the split of StoreIC to StoreGlobalIC and StoreIC.

StubCache tests now exercise both load and store ICs.

BUG=chromium:576312

Review-Url: https://codereview.chromium.org/2163253002
Cr-Commit-Position: refs/heads/master@{#39751}