[tsan] Replace ALIGNED with alignas

Similar to #98958.

The relands 656f617ac772c54e0bee9d499e7ca232137ddb35 , which
was reverted due to an issue in tsan_platform_mac.cpp

Pull Request: https://github.com/llvm/llvm-project/pull/98959

compiler-rt/lib/tsan/rtl/tsan_defs.h

@@ -30,7 +30,7 @@
 #  define __MM_MALLOC_H
 #  include <emmintrin.h>
 #  include <smmintrin.h>
-#  define VECTOR_ALIGNED ALIGNED(16)
+#  define VECTOR_ALIGNED alignas(16)
 typedef __m128i m128;
 #else
 #  define VECTOR_ALIGNED

compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp

@@ -208,7 +208,7 @@ struct AtExitCtx {
 struct InterceptorContext {
   // The object is 64-byte aligned, because we want hot data to be located
   // in a single cache line if possible (it's accessed in every interceptor).
-  ALIGNED(64) LibIgnore libignore;
+  alignas(64) LibIgnore libignore;
   __sanitizer_sigaction sigactions[kSigCount];
 #if !SANITIZER_APPLE && !SANITIZER_NETBSD
   unsigned finalize_key;
@@ -220,7 +220,7 @@ struct InterceptorContext {
   InterceptorContext() : libignore(LINKER_INITIALIZED), atexit_mu(MutexTypeAtExit), AtExitStack() {}
 };
 
-static ALIGNED(64) char interceptor_placeholder[sizeof(InterceptorContext)];
+alignas(64) static char interceptor_placeholder[sizeof(InterceptorContext)];
 InterceptorContext *interceptor_ctx() {
   return reinterpret_cast<InterceptorContext*>(&interceptor_placeholder[0]);
 }

compiler-rt/lib/tsan/rtl/tsan_interface_ann.cpp

@@ -76,7 +76,7 @@ struct DynamicAnnContext {
 };
 
 static DynamicAnnContext *dyn_ann_ctx;
-static char dyn_ann_ctx_placeholder[sizeof(DynamicAnnContext)] ALIGNED(64);
+alignas(64) static char dyn_ann_ctx_placeholder[sizeof(DynamicAnnContext)];
 
 static void AddExpectRace(ExpectRace *list,
     char *f, int l, uptr addr, uptr size, char *desc) {

compiler-rt/lib/tsan/rtl/tsan_mman.cpp

@@ -54,7 +54,7 @@ struct MapUnmapCallback {
   }
 };
 
-static char allocator_placeholder[sizeof(Allocator)] ALIGNED(64);
+alignas(64) static char allocator_placeholder[sizeof(Allocator)];
 Allocator *allocator() {
   return reinterpret_cast<Allocator*>(&allocator_placeholder);
 }
@@ -75,7 +75,7 @@ struct GlobalProc {
         internal_alloc_mtx(MutexTypeInternalAlloc) {}
 };
 
-static char global_proc_placeholder[sizeof(GlobalProc)] ALIGNED(64);
+alignas(64) static char global_proc_placeholder[sizeof(GlobalProc)];
 GlobalProc *global_proc() {
   return reinterpret_cast<GlobalProc*>(&global_proc_placeholder);
 }

compiler-rt/lib/tsan/rtl/tsan_rtl.cpp

@@ -48,11 +48,10 @@ int (*on_finalize)(int);
 #endif
 
 #if !SANITIZER_GO && !SANITIZER_APPLE
-__attribute__((tls_model("initial-exec")))
-THREADLOCAL char cur_thread_placeholder[sizeof(ThreadState)] ALIGNED(
-    SANITIZER_CACHE_LINE_SIZE);
+alignas(SANITIZER_CACHE_LINE_SIZE) THREADLOCAL __attribute__((tls_model(
+    "initial-exec"))) char cur_thread_placeholder[sizeof(ThreadState)];
 #endif
-static char ctx_placeholder[sizeof(Context)] ALIGNED(SANITIZER_CACHE_LINE_SIZE);
+alignas(SANITIZER_CACHE_LINE_SIZE) static char ctx_placeholder[sizeof(Context)];
 Context *ctx;
 
 // Can be overriden by a front-end.

compiler-rt/lib/tsan/rtl/tsan_rtl.h

@@ -136,7 +136,7 @@ struct TidEpoch {
   Epoch epoch;
 };
 
-struct TidSlot {
+struct alignas(SANITIZER_CACHE_LINE_SIZE) TidSlot {
   Mutex mtx;
   Sid sid;
   atomic_uint32_t raw_epoch;
@@ -153,10 +153,10 @@ struct TidSlot {
   }
 
   TidSlot();
-} ALIGNED(SANITIZER_CACHE_LINE_SIZE);
+};
 
 // This struct is stored in TLS.
-struct ThreadState {
+struct alignas(SANITIZER_CACHE_LINE_SIZE) ThreadState {
   FastState fast_state;
   int ignore_sync;
 #if !SANITIZER_GO
@@ -234,7 +234,7 @@ struct ThreadState {
   const ReportDesc *current_report;
 
   explicit ThreadState(Tid tid);
-} ALIGNED(SANITIZER_CACHE_LINE_SIZE);
+};
 
 #if !SANITIZER_GO
 #if SANITIZER_APPLE || SANITIZER_ANDROID

compiler-rt/lib/tsan/rtl/tsan_suppressions.cpp

@@ -42,7 +42,7 @@ const char *__tsan_default_suppressions() {
 
 namespace __tsan {
 
-ALIGNED(64) static char suppression_placeholder[sizeof(SuppressionContext)];
+alignas(64) static char suppression_placeholder[sizeof(SuppressionContext)];
 static SuppressionContext *suppression_ctx = nullptr;
 static const char *kSuppressionTypes[] = {
     kSuppressionRace,   kSuppressionRaceTop, kSuppressionMutex,

compiler-rt/lib/tsan/rtl/tsan_vector_clock.h

@@ -34,7 +34,7 @@ class VectorClock {
   VectorClock& operator=(const VectorClock& other);
 
  private:
-  Epoch clk_[kThreadSlotCount] VECTOR_ALIGNED;
+  VECTOR_ALIGNED Epoch clk_[kThreadSlotCount];
 };
 
 ALWAYS_INLINE Epoch VectorClock::Get(Sid sid) const {