[PATCH] Pass le32-specific flags to -cc1

[Eli Bendersky]

Hello,

This patch adds passing of architecture-specific flags from the Clang
driver to -cc1 for the le32 architecture. The first such flag is
-fno-math-builtin.

This is part 2 of the set of patches that switch the current approach of
CGBuiltin hooks to making the decision in the driver. The first part
(teaching -cc1 about the -fno-math-builtin flag) was committed in r186899.
The third and final part will revert the CGBuiltin hooks and rewrite the
test to use the new logic.

PTAL,
Eli
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