[Test] Disable a test case while investigating non-deterministic crash

rdar://problem/71046813

Author: rintaro

lit_tests/parser-diags.swift

@@ -1,5 +1,7 @@
 // RUN: %lit-test-helper -source-file %s -dump-diags 2>&1 | %FileCheck %s
 
+// REQUIRES: rdar71046813
+
 // CHECK: [[@LINE+2]]:11 error: consecutive statements on a line must be separated by ';'
 // CHECK-NEXT: Fixit: ([[@LINE+1]]:11,[[@LINE+1]]:11) Text: ";"
 let number⁚ Int