[llvm] [ASan][JSON] Unpoison memory before its reuse (PR #79065)

[Vitaly Buka via llvm-commits]

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@@ -482,6 +482,13 @@ class Value {
   friend class Object;
 
   template <typename T, typename... U> void create(U &&... V) {
+#if defined(LLVM_ADDRESS_SANITIZER_BUILD)
+    // Unpoisoning to prevent overwriting poisoned object (e.g., annotated short
+    // string). Objects that have had their memory poisoned may cause an ASan
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vitalybuka wrote:

LGTM

https://github.com/llvm/llvm-project/pull/79065