Summary:
* arm-linux-gnueabihf and multilib support for linaro toolchain.
* Code size benchmark analysis.

Details:
1. arm-linux-gnueabihf support for linaro toolchain
  * Update gcc, libgcc and libstdc++ config to support the triplet.
  * Update build scripts to gnueabihf.
  * Add sample config for gnueabihf.
2. Multilib support for linaro toolchain
  * Merge Terry's multilib patches
(http://gcc.gnu.org/ml/gcc-patches/2012-04/msg00975.html
http://gcc.gnu.org/ml/gcc-patches/2012-05/msg00083.html) and revise
them for linaro.
  * Update gcc.c and incpath.c to make multiarch and multilib work together.
  * libgcc for armv4t (-mfloat-abi=soft) build fail: ld: error:
armv4t/libgcc_s.so.1.tmp uses VFP register arguments, ... does not.
    Root cause: crt*.o from precise sysroot use VFP_args, while other
objects are built with -mfloat-abi=soft. We need additional crt*.o to
build libgcc for armv4t.
3. Code size regression analysis
  We find more regression cases introduced by ivopt and loop invariant.

Plans:
* Investigate other code size regressions in 4.7.
* Finalize the arm-linux-gnueabihf and multilib support for linaro toolchain.

Best regards!
-Zhenqiang

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