scudo: Replace ALIGNED macro with standard alignas specifier.

alignas was introduced in C++11 and is already being used throughout LLVM.

Differential Revision: https://reviews.llvm.org/D77823

Author: pcc

compiler-rt/lib/scudo/standalone/atomic_helpers.h

@@ -51,7 +51,7 @@ struct atomic_u32 {
 struct atomic_u64 {
   typedef u64 Type;
   // On 32-bit platforms u64 is not necessarily aligned on 8 bytes.
-  ALIGNED(8) volatile Type ValDoNotUse;
+  alignas(8) volatile Type ValDoNotUse;
 };
 
 struct atomic_uptr {

compiler-rt/lib/scudo/standalone/internal_defs.h

@@ -33,9 +33,6 @@
 #define WEAK __attribute__((weak))
 #define ALWAYS_INLINE inline __attribute__((always_inline))
 #define ALIAS(X) __attribute__((alias(X)))
-// Please only use the ALIGNED macro before the type. Using ALIGNED after the
-// variable declaration is not portable.
-#define ALIGNED(X) __attribute__((aligned(X)))
 #define FORMAT(F, A) __attribute__((format(printf, F, A)))
 #define NOINLINE __attribute__((noinline))
 #define NORETURN __attribute__((noreturn))

compiler-rt/lib/scudo/standalone/primary32.h

@@ -225,7 +225,7 @@ class SizeClassAllocator32 {
     u64 LastReleaseAtNs;
   };
 
-  struct ALIGNED(SCUDO_CACHE_LINE_SIZE) SizeClassInfo {
+  struct alignas(SCUDO_CACHE_LINE_SIZE) SizeClassInfo {
     HybridMutex Mutex;
     SinglyLinkedList<TransferBatch> FreeList;
     uptr CurrentRegion;

compiler-rt/lib/scudo/standalone/primary64.h

@@ -231,7 +231,7 @@ class SizeClassAllocator64 {
     u64 LastReleaseAtNs;
   };
 
-  struct ALIGNED(SCUDO_CACHE_LINE_SIZE) RegionInfo {
+  struct alignas(SCUDO_CACHE_LINE_SIZE) RegionInfo {
     HybridMutex Mutex;
     SinglyLinkedList<TransferBatch> FreeList;
     RegionStats Stats;

compiler-rt/lib/scudo/standalone/tests/mutex_test.cpp

@@ -52,7 +52,7 @@ class TestData {
   static const scudo::u32 Size = 64U;
   typedef scudo::u64 T;
   scudo::HybridMutex &Mutex;
-  ALIGNED(SCUDO_CACHE_LINE_SIZE) T Data[Size];
+  alignas(SCUDO_CACHE_LINE_SIZE) T Data[Size];
 };
 
 const scudo::u32 NumberOfThreads = 8;

compiler-rt/lib/scudo/standalone/tsd.h

@@ -23,7 +23,7 @@
 
 namespace scudo {
 
-template <class Allocator> struct ALIGNED(SCUDO_CACHE_LINE_SIZE) TSD {
+template <class Allocator> struct alignas(SCUDO_CACHE_LINE_SIZE) TSD {
   typename Allocator::CacheT Cache;
   typename Allocator::QuarantineCacheT QuarantineCache;
   u8 DestructorIterations;