62afb87d9c
PR go/78763
compiler: call determine_types even for constant expressions
We need to call determine_types even for constant expressions, since a
constant expression may include code like unsafe.Sizeof(0). Something
needs to determine the type of the untyped 0, and that should be the
determine_types pass.
Implementing that triggered a compiler crash on test/const1.go because
it permitted some erroneous constants to make it all the way to the
backend. Catch that case by checking whether we get a constant
overflow error, and marking the expression invalid if we do. This is
a good change in any case, as previously we reported the same constant
overflow error multiple times, and now we only report it once.
Fixes GCC PR 78763.
Reviewed-on: https://go-review.googlesource.com/34496
From-SVN: r243729
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