[tree-ssa] Can't build gcc 20040328 on cygwin: libstdc++-v3/include/ext/pool_allocator.h:299: internal compiler error: verify_stmts failed

[David Edelsohn]

> /usr/local/src/gcc-binutils/branch/objdir/i686-pc-cygwin/libstdc++-v3/include/ext/pool_allocator.h:299: error: Invalid operand to binary operator
(int<D2>)__n<D10755>_17;
> /usr/local/src/gcc-binutils/branch/objdir/i686-pc-cygwin/libstdc++-v3/include/ext/pool_allocator.h:299: internal compiler error: verify_stmts failed.

> Any ideas?

	The merge seems to have brought in either a change in C++ code
generation or use of a new idiom in libstdc++-v3 that evokes a known bug
in Tree-SSA.  This also broke Tree-SSA libstdc++-v3 bootstrap on PowerPC
for some ABIs.  See Bugzilla PR 14682.

David