test: skip finalizerinvariants.go on riscv-qemu

The finalizer code stops or fails on multicore RISC-V. Locally, 10 of 100
runs fail. 5 runs stop, with one hart in runGC and the other harts in
schedulerUnlockAndWait. 5 runs fail with mcause=5 in runtime.scanConservative.
Skip the test on this target until #5679 is corrected.

main_test.go

@@ -468,6 +468,14 @@ func runPlatTests(options compileopts.Options, tests []string, t *testing.T) {
 				continue
 			}
 		}
+		if options.Target == "riscv-qemu" {
+			switch name {
+			case "finalizerinvariants.go":
+				// The finalizer code stops or fails on multicore RISC-V.
+				// See https://github.com/tinygo-org/tinygo/issues/5679
+				continue
+			}
+		}
 
 		name := name // redefine to avoid race condition
 		t.Run(name, func(t *testing.T) {