target-sparc: Store %asi in TB flags

target-sparc: Store %asi in TB flags

Knowing the value of %asi at translation time means that we
can handle the common settings without a function call.

The steady state appears to be %asi == ASI_P, so that sparcv9
code can use offset forms of lda/sta.  The %asi register gets
pushed and popped on entry to certain functions, but it rarely
takes on values other than ASI_P or ASI_AIUP.  Therefore we're
unlikely to be expanding the set of TBs created.

Tested-by: Mark Cave-Ayland <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>