Fix getfield codegen for tuple inputs and unknown symbol fields. (#51234)

(cherry picked from commit eab8d6b)

Author: maleadt

src/codegen.cpp

@@ -3830,7 +3830,7 @@ static bool emit_builtin_call(jl_codectx_t &ctx, jl_cgval_t *ret, jl_value_t *f,
         }
         else if (fld.typ == (jl_value_t*)jl_symbol_type) { // Known type but unknown symbol
             if (jl_is_datatype(utt) && (utt != jl_module_type) && jl_struct_try_layout(utt)) {
-                if ((jl_datatype_nfields(utt) == 1 && !jl_is_namedtuple_type(utt))) {
+                if ((jl_datatype_nfields(utt) == 1 && !jl_is_namedtuple_type(utt) && !jl_is_tuple_type(utt))) {
                     jl_svec_t *fn = jl_field_names(utt);
                     assert(jl_svec_len(fn) == 1);
                     Value *typ_sym = literal_pointer_val(ctx, jl_svecref(fn, 0));

test/compiler/codegen.jl

@@ -849,15 +849,6 @@ let res = @timed a50317[:b]
     return res
 end
 
-# Very specific test for multiversioning
-if Sys.ARCH === :x86_64
-    foo52079() = Core.Intrinsics.have_fma(Float64)
-    if foo52079() == true
-        let io = IOBuffer()
-            code_native(io,^,(Float64,Float64), dump_module=false)
-            str = String(take!(io))
-            @test !occursin("fma_emulated", str)
-            @test occursin("vfmadd", str)
-        end
-    end
-end
+# https://github.com/JuliaLang/julia/issues/51233
+obj51233 = (1,)
+@test_throws ErrorException obj51233.x