This patch extends the typed lowering with a specialized version of 'instanceof' that is used if the "class", i.e. the constructor function, is a known constant.

Unittests check that replacement occurs as intended. Functional correctness is ensured by extensive unit tests covering instanceof already in the testsuite.

TESTS=unittests/JSTypedLoweringTest.{JSInstanceOfSpecializationWithSmiCheck,JSInstanceOfSpecializationWithoutSmiCheck,JSInstanceOfNoSpecialization}

Review URL: https://codereview.chromium.org/1407413014

Cr-Commit-Position: refs/heads/master@{#31916}