[PATCH] Clang/driver: emulated TLS mode.

[Chih-Hung Hsieh]

This patch should keep the default clang/llvm configuration for all targets, but add the necessary -ftls-model=emulated flag for Android users that need TLS.
Please see also the comments in the llvm bug:
https://llvm.org/bugs/show_bug.cgi?id=23566#c4


http://reviews.llvm.org/D10524

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