[Bug go/89321] cross build with riscv64 gccgo compilation failed due to assert in constructor_expression

[ian at airs dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89321

--- Comment #3 from Ian Lance Taylor <ian at airs dot com> ---
I'm not sure exactly what assert it is, because there is no assert on that line
of go-gcc.cc.  But it is most likely an assertion saying that when compiling a
struct composite literal, the number of fields in the struct does not match the
number of values in the composite literal.  That should be impossible, since
the compiler fills in zero values as needed.  So unfortunately I'm not sure
that is all that helpful.