Add generic type coercion utility functions#1200

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thejoshwolfe wants to merge 4 commits intotc39:masterfrom thejoshwolfe:type-coercion

+338

Commits on Aug 28, 2017

type coercion harness utilities
Josh Wolfe
committed

Commits on Aug 29, 2017

use informative stack traces instead of loops
Josh Wolfe
committed

Commits on Aug 30, 2017

more separation of ToInteger from ToNumber
Josh Wolfe
committed
test for String.prototype.indexOf first parameter type coercion
Josh Wolfe
committed