optimization/4490: gcc 3.0.1 segfaults while compiling pack_isam.c of mysql

[rth@gcc.gnu.org]

Synopsis: gcc 3.0.1 segfaults while compiling pack_isam.c of mysql

State-Changed-From-To: analyzed->suspended
State-Changed-By: rth
State-Changed-When: Wed Apr  3 01:02:02 2002
State-Changed-Why:
    The problem is that the front-end isn't told about the 128-bit
    type, so type_for_mode returns NULL.
    
    -m128bit-long-double really needs to be using TFmode within
    the compiler, rather than playing games with XFmode.

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