Two changes related to pnacl's libgcc: * move the setting of compiler flags from the Makefile into utman * add a new experimental phase for building libgcc as bitcode
Two changes related to pnacl's libgcc:
* move the setting of compiler flags from the Makefile into utman
* add a new experimental phase for building libgcc as bitcode

This CL activates analogous changes made to compiler-rt
via a stable rev update: http://codereview.chromium.org/7205042/

NOTE: for this to become effective further changes are needed to llvm repos
 

BUG= http://code.google.com/p/nativeclient/issues/detail?id=1520
Review URL: http://codereview.chromium.org/7212015

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@5727 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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