[Bug bootstrap/61092] [4.10 Regression]: wide-int merge broke alpha bootstrap

["ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61092

--- Comment #2 from UroÅ Bizjak <ubizjak at gmail dot com> ---
The failure can be triggered with an attached precompiled source using a
crosscompiler from x86-64 to alphaev68-pc-linux-gnu, with -O2:

~/gcc-build-xxx/gcc/cc1plus -O2 -quiet wide-int.ii 
cc1plus: error: no include path in which to search for stdc-predef.h
../../gcc-svn/trunk/gcc/wide-int.cc: In function âunsigned int
wi::mul_internal(long int*, const long int*, unsigned int, const long int*,
unsigned int, unsigned int, signop, bool*, bool)â:
../../gcc-svn/trunk/gcc/wide-int.cc:1269:70: sorry, unimplemented: unexpected
AST of kind mult_highpart_expr
../../gcc-svn/trunk/gcc/wide-int.cc:1269:70: internal compiler error: in
potential_constant_expression_1, at cp/semantics.c:10575
0x6a1a3f potential_constant_expression_1
        ../../gcc-svn/trunk/gcc/cp/semantics.c:10575
0x6a9c2c potential_constant_expression(tree_node*)
        ../../gcc-svn/trunk/gcc/cp/semantics.c:10585
0x6a9cb3 maybe_constant_value(tree_node*)
        ../../gcc-svn/trunk/gcc/cp/semantics.c:9927
...