pnacl-clang: build newlib with Clang (not integrated with the waterfall yet).
pnacl-clang: build newlib with Clang (not integrated with the waterfall yet).

In order to manually test it:

tools/llvm/utman.sh all
tools/llvm/utman.sh sdk
tools/llvm/utman.sh clang-libs # this will build newlib, compiler-rt and libgcc_eh with Clang

After that,

./scons platform=x86-64 pnacl_use_clang=1 bitcode=1 small_tests -j16

BUG= http://code.google.com/p/nativeclient/issues/detail?id=2290
Review URL: http://codereview.chromium.org/8084011

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@6823 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client