X87: [builtins] Simplify String constructor code.
port eadfd666 (r30706). original commit message: The String constructor was somewhat complex with a lot of micro optimizations that are not relevant or even misguided. It would be really hard to port that code to ES6, which requires String to be subclassable. So as a first step we reduced the necessary complexity to the bare minimum (also removing the last user of the fairly complex MacroAssembler::LookupNumberStringCache method). This also removes the counters for the String constructor, which were not properly exposed anymore (and not kept in sync with inlined versions of the String constructor anyway). BUG= Review URL: https://codereview.chromium.org/1336133003 Cr-Commit-Position: refs/heads/master@{#30744}
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