utman: add an action to build Clang portable bitcode SDK (toolchain + SDK addons, like newlib/libstdc++/etc)
utman: add an action to build Clang portable bitcode SDK (toolchain + SDK addons, like newlib/libstdc++/etc)

The supposed usage is:
tools/llvm/utman.sh everything-clang

BUG= http://code.google.com/p/nativeclient/issues/detail?id=2306
Review URL: http://codereview.chromium.org/8059032

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@6809 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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