[PATCH, c]: Fix PR32191, sefgault for complex multc3 (and divtc3) for -std=c99

[Uros Bizjak]

Hello!

As described in PR32191, we currently segfault when composing call to 
complex __multc3/__divtc3 functions for target-defined FP modes (i.e. 
__float128 in x86_64 case). The problem is, that these calls are created 
in build_common_build_nodes() which calls c_common_type_for_node(). 
However, target dependent modes are created in init_builtins() target 
hook that is called just _after_ the call to build_common_builtin_nodes().

The fix is simple and straightforward. Put the call to init_builtins() 
target hook in front of the call to build_common_build_nodes().

Attached patch was bootstrapped on x86_64-pc-linux-gnu for all default 
languages; regression testing is in progress, but all interesting cases 
have already been passed.

OK for mainline if regtest pass?

2007-06-04  Uros Bizjak  <ubizjak@gmail.com>

        PR c/32191
        * gcc/c-common.c (c_define_builtins): Call targetm.init_builtins ()
        before build_common_builtin_nodes ().

testsuite/ChangeLog:

2007-06-04  Uros Bizjak  <ubizjak@gmail.com>

        PR c/32191
        * gcc.dg/pr32191.c: New test.

BTW: This patch fixes the ICE, but we still need to create __multc3 and 
__divtc3 support functions. We can put them into soft-fp directory to be 
shared between other targets (and we are free to put TFmode/TCmode 
functions into gcc's soft-fp local directory). This will be a follow-up 
patch.

Uros.
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