[compiler-rt] Add API to temporalily disable usage of ASAN's fake stack (PR #160135)

[Vitaly Buka via llvm-commits]

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@@ -144,6 +144,11 @@ class AsanThread {
     GetStartData(&data, sizeof(data));
   }
 
+  bool fake_stack_usage_enabled() const { return fake_stack_usage_enabled_; }
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vitalybuka wrote:

IsFakeStackEnabled/SetFakeStackEnabled

https://github.com/llvm/llvm-project/pull/160135