X87: [builtins] Introduce a proper BUILTIN frame type.
port f47b9e98 (r37051) original commit message: This adds a new BUILTIN frame type, which supports variable number of arguments for builtins implemented in hand-written native code (we will extend this mechanism to TurboFan builtins at some point). Convert the Math.max and Math.min builtins to construct a BUILTIN frame if required. This does not yet work for C++ builtins, but that'll be the next step. BUG= Review-Url: https://codereview.chromium.org/2096283003 Cr-Commit-Position: refs/heads/master@{#37270}
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