X87: [compiler] Introduce code stubs for string relational comparisons.
port 5912e0f0(r34485) original commit message: Add StringLessThanStub, StringLessThanOrEqualStub, StringGreaterThanStub and StringGreaterThanOrEqualStub, based on the CodeStubAssembler, and hook them up with TurboFan (and Ignition). The stubs are currently essentially comparable with the StringCompareStub, which is now obsolete. We can later extend these stubs to cover more interesting cases (i.e. two byte sequential string comparisons, etc.). BUG= Review URL: https://codereview.chromium.org/1768013002 Cr-Commit-Position: refs/heads/master@{#34516}
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