Fix getfield_tfunc for constant TypeName

The field should be either `Symbol` or `Int`. Ref #37423

Unlike #37423, in additional to worse type info in inference,
the missing type check here can actually cause type inference error
due to errors in user code.

base/compiler/tfuncs.jl

@@ -761,7 +761,13 @@ function getfield_tfunc(@nospecialize(s00), @nospecialize(name))
                     t === nothing || return t
                 end
             elseif isa(sv, Core.TypeName)
-                fld = isa(nv, Symbol) ? fieldindex(Core.TypeName, nv, false) : nv
+                fld = if isa(nv, Symbol)
+                    fieldindex(Core.TypeName, nv, false)
+                elseif isa(nv, Int)
+                    nv
+                else
+                    return Bottom
+                end
                 if (fld == TYPENAME_NAME_FIELDINDEX ||
                     fld == TYPENAME_MODULE_FIELDINDEX ||
                     fld == TYPENAME_WRAPPER_FIELDINDEX)

test/compiler/inference.jl

@@ -2751,3 +2751,23 @@ f_generator_splat(t::Tuple) = tuple((identity(l) for l in t)...)
 @test !Core.Compiler.sizeof_nothrow(UnionAll)
 
 @test Base.return_types(Expr) == Any[Expr]
+
+# Use a global constant to rely less on unrelated constant propagation
+const const_int32_typename = Int32.name
+getfield_const_typename_good1() = getfield(const_int32_typename, 1)
+getfield_const_typename_good2() = getfield(const_int32_typename, :name)
+getfield_const_typename_bad1() = getfield(const_int32_typename, 0x1)
+@eval getfield_const_typename_bad2() = getfield(const_int32_typename, $(()))
+for goodf in [getfield_const_typename_good1, getfield_const_typename_good2]
+    local goodf
+    local code = code_typed(goodf, Tuple{})[1].first.code
+    @test code[1] === Core.ReturnNode(QuoteNode(:Int32))
+    @test goodf() === :Int32
+end
+for badf in [getfield_const_typename_bad1, getfield_const_typename_bad2]
+    local badf
+    local code = code_typed(badf, Tuple{})[1].first.code
+    @test Meta.isexpr(code[1], :call)
+    @test code[end] === Core.ReturnNode()
+    @test_throws TypeError badf()
+end