Drop line because it's a set so arbitrary sorting applies (#1043)

Author: jonmeow

executable_semantics/testdata/basic_syntax/trace.carbon

@@ -13,7 +13,7 @@
 // CHECK: fn Print (format_str: String) {
 // CHECK: ********** type checking **********
 // CHECK: checking pattern (format_str: String)
-// CHECK: constants: Main: fun<Main>, Print: fun<Print>
+// CHECK: constants: {{.*Main: fun<Main>.*}}
 // CHECK: ********** type checking complete **********
 // CHECK: fn Print (format_str: String) {
 // CHECK: ********** starting execution **********