[llvm] [asan][x86] Abort instrumenting memintrinsics that target fs, gs (PR #129291)

[Alexander Potapenko via llvm-commits]

================
@@ -0,0 +1,60 @@
+; RUN: opt -passes=asan %s -S | FileCheck %s
+
+;; Punt AddressSanitizer::instrumentMemIntrinsics out for MemIntrinsics
+;; that need write to unsupported registers on X86
----------------
ramosian-glider wrote:

nit: "need to write"
Also, as far as I understand, these are unsupported address spaces, not unsupported registers?

https://github.com/llvm/llvm-project/pull/129291