Integrate LLVM at llvm/llvm-project@a531800344dc

Updates LLVM usage to match
[a531800344dc](llvm/llvm-project@a531800344dc)

PiperOrigin-RevId: 714047103

third_party/llvm/generated.patch

@@ -1,17 +1 @@
 Auto generated patch. Do not edit or delete it, even if empty.
-diff -ruN --strip-trailing-cr a/llvm/lib/Support/Timer.cpp b/llvm/lib/Support/Timer.cpp
---- a/llvm/lib/Support/Timer.cpp
-+++ b/llvm/lib/Support/Timer.cpp
-@@ -507,11 +507,11 @@
-   // Order of these members and initialization below is important. For example
-   // the DefaultTimerGroup uses the TimerLock. Most of these also depend on the
-   // options above.
-+  std::once_flag InitDeferredFlag;
-   std::unique_ptr<SignpostEmitter> SignpostsPtr;
-   std::unique_ptr<sys::SmartMutex<true>> TimerLockPtr;
-   std::unique_ptr<TimerGroup> DefaultTimerGroupPtr;
-   std::unique_ptr<Name2PairMap> NamedGroupedTimersPtr;
--  std::once_flag InitDeferredFlag;
-   TimerGlobals &initDeferred() {
-     std::call_once(InitDeferredFlag, [this]() {
-       SignpostsPtr = std::make_unique<SignpostEmitter>();

third_party/llvm/workspace.bzl

@@ -4,8 +4,8 @@ load("//third_party:repo.bzl", "tf_http_archive")
 
 def repo(name):
     """Imports LLVM."""
-    LLVM_COMMIT = "644de6ad1c758d3bf754d7d50b98c555df5231b1"
-    LLVM_SHA256 = "8ccd3cd59205f36019192d9dabd4dd49603fc4345fb57cdf323a55570cb572bd"
+    LLVM_COMMIT = "a531800344dc54e9c197a13b22e013f919f3f5e1"
+    LLVM_SHA256 = "74a873f8d4c677d192e9bfade095af3363c76b0fb23c5f6260121d74322744bc"
 
     tf_http_archive(
         name = name,