RFA: Quickly discard pseudo lifeness information after reload

[Joern RENNECKE]

Joern Rennecke wrote:

>  
>
>2005-12-02  J"orn Rennecke <joern.rennecke@st.com>
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>	* bitmap.c (bitmap_clear_from): New function.
>	* bitmap.h (bitmap_clear_from): Declare.
>	* flow.c (rest_of_handle_flow2): Discard pseudo lifeness information.
>
>  
>
Regtests passed on i686-pc-linux-gnu native, X sh-elf and X sh64-elf.