optimizer: SROA should preserve statement that may throw

[aviatesk]

julia> @inline function foo(a::Int, b)
           r = Ref(a)
           try
               setfield!(r, :x, b)
               nothing
           catch err
               return 42
           end
       end
foo (generic function with 1 method)

julia> code_typed(foo, (Int,String))
1-element Vector{Any}:
 CodeInfo(
1 ─      nothing::Nothing
2 ─ %2 = $(Expr(:enter, #4))
3 ─      unreachable
4 ┄      $(Expr(:leave, 1))
5 ─      $(Expr(:pop_exception, :(%2)))::Any
└──      return 42
) => Int64

julia> foo(42, "julia")

[26644] signal (4.1): Illegal instruction: 4
in expression starting at REPL[10]:1
...