[PATCH, alpha]: Fix ICE after the fix for intrinsic_nearest.f90 failure

[Uros Bizjak <ubizjak at gmail dot com>]

Hello!

The fix for intrinsic_nearest.f90 failure that disabled a couple of insn 
patterns in IEEE mode [1] introduced an ICE [2] with unrecognisable insn:

(set (reg:DF 135)
        (lt:DF (float_extend:DF (reg:SF 133))
            (float_extend:DF (reg:SF 86 [ b.2 ])))) -1 (nil))

The problem is fixed by disabling a couple of expanders that expand to 
disabled insns in IEEE mode.  The patch also disables one remaining insn 
that inherently expands SFmode operand to DFmode in IEEE mode.

Patch was tested on alphaev68-unknown-linux-gnu {,-mieee}.

2009-09-14  Uros Bizjak <ubizjak@gmail.com>

    * config/alpha/alpha.md (smaxsf3): Disable for IEEE mode.
    (sminsf3): Ditto.
    (*fbcc_ext_normal): Ditto.

The patch will be applied to all active branches after testing.

[1] http://gcc.gnu.org/ml/gcc-patches/2009-08/msg01199.html
[2] http://gcc.gnu.org/ml/gcc-testresults/2009-09/msg01173.html

Uros.

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