Use the methods recommended by ARM to flush ICache.
Use the methods recommended by ARM to flush ICache.

This allows us to remove selecting different versions of
inline assembly depending on ABI, thumb, etc. in our code.

R=regis@google.com

Review URL: https://codereview.chromium.org//26543002

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@28378 260f80e4-7a28-3924-810f-c04153c831b5

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