[PATCH] Mostly standardize on "MumbleToolChain" as the ToolChain subclass name. NFC

[Douglas Katzman]

Adding the folks who originally authored the XCore and NaCl_TC as reviewers.

Since we're spelling out CrossWindowsToolChain, it shouldn't be much of an imposition to spell out NaClToolChain and XCoreToolChain


http://reviews.llvm.org/D10609

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