Let compound literal array be broadcast to a struct field of arrays

Fixes #4364

Patch courtesy of @cribalik

tests/issues/test_issue_4364.odin

@@ -0,0 +1,18 @@
+// Tests issue #4364 https://github.com/odin-lang/Odin/issues/4364
+package test_issues
+
+import "core:testing"
+
+@test
+test_const_array_fill_assignment :: proc(t: ^testing.T) {
+	MAGIC :: 12345
+	Struct :: struct {x: int}
+	CONST_ARR : [4]Struct : Struct{MAGIC}
+	arr := CONST_ARR
+
+	testing.expect_value(t, len(arr), 4)
+	testing.expect_value(t, arr[0], Struct{MAGIC})
+	testing.expect_value(t, arr[1], Struct{MAGIC})
+	testing.expect_value(t, arr[2], Struct{MAGIC})
+	testing.expect_value(t, arr[3], Struct{MAGIC})
+}