The "simple" function with inline assembly for detecting hardfloat have been changed to handle compiling without VFP and with thumb.

The SCons setting for the float abi now follows then naming used by the GCC -mfloat-abi and soft has been added.

R=karlklose@chromium.org

BUG=none
TEST=none

Review URL: http://codereview.chromium.org//6904126

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7725 ce2b1a6d-e550-0410-aec6-3dcde31c8c00