X87: [runtime] Introduce dedicated JSBoundFunction to represent bound functions.
port 97def807 (r33044) original commit message: According to the ES2015 specification, bound functions are exotic objects, and thus don't need to be implemented as JSFunctions. So we introduce a new JSBoundFunction type to represent bound functions and make them optimizable. This already improves the performance of calling or constructing bound functions by 10-100x depending on the use case because we avoid the crazy dance between JavaScript and C++ that was implemented in v8natives.js previously. There's still room for improvement in the performance of actually creating bound functions, which is also relevant in practice, but we already have a plan how to accomplish that later. The mips/mips64 ports were contributed by akos.palfi@imgtec.com. BUG= Review URL: https://codereview.chromium.org/1548253002 Cr-Commit-Position: refs/heads/master@{#33046}
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src/x87/builtins-x87.cc
100755 → 100644
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