Replace LLVM_ALIGNAS with just alignas.

Various places in Clang and LLVM are already using alignas; it seems
our minimum host configuration now requires it.

llvm-svn: 337330
diff --git a/clang/include/clang/AST/Decl.h b/clang/include/clang/AST/Decl.h
index e419ded..a098608 100644
--- a/clang/include/clang/AST/Decl.h
+++ b/clang/include/clang/AST/Decl.h
@@ -83,7 +83,7 @@
 /// TypeLoc TL = TypeSourceInfo->getTypeLoc();
 /// TL.getStartLoc().print(OS, SrcMgr);
 /// @endcode
-class LLVM_ALIGNAS(8) TypeSourceInfo {
+class alignas(8) TypeSourceInfo {
   // Contains a memory block after the class, used for type source information,
   // allocated by ASTContext.
   friend class ASTContext;
@@ -2860,7 +2860,7 @@
 
 /// Base class for declarations which introduce a typedef-name.
 class TypedefNameDecl : public TypeDecl, public Redeclarable<TypedefNameDecl> {
-  struct LLVM_ALIGNAS(8) ModedTInfo {
+  struct alignas(8) ModedTInfo {
     TypeSourceInfo *first;
     QualType second;
   };
diff --git a/clang/include/clang/AST/DeclBase.h b/clang/include/clang/AST/DeclBase.h
index 5ca5907..f99bd62 100644
--- a/clang/include/clang/AST/DeclBase.h
+++ b/clang/include/clang/AST/DeclBase.h
@@ -83,7 +83,7 @@
 /// (and its subclasses) in its Decl::operator new(). Proper alignment
 /// of all subclasses (not requiring more than the alignment of Decl) is
 /// asserted in DeclBase.cpp.
-class LLVM_ALIGNAS(/*alignof(uint64_t)*/ 8) Decl {
+class alignas(8) Decl {
 public:
   /// Lists the kind of concrete classes of Decl.
   enum Kind {
diff --git a/clang/include/clang/AST/Type.h b/clang/include/clang/AST/Type.h
index 9e024c1..cbdbc52 100644
--- a/clang/include/clang/AST/Type.h
+++ b/clang/include/clang/AST/Type.h
@@ -4644,7 +4644,7 @@
 /// TemplateArguments, followed by a QualType representing the
 /// non-canonical aliased type when the template is a type alias
 /// template.
-class LLVM_ALIGNAS(/*alignof(uint64_t)*/ 8) TemplateSpecializationType
+class alignas(8) TemplateSpecializationType
     : public Type,
       public llvm::FoldingSetNode {
   friend class ASTContext; // ASTContext creates these
@@ -5062,7 +5062,7 @@
 /// Represents a template specialization type whose template cannot be
 /// resolved, e.g.
 ///   A<T>::template B<T>
-class LLVM_ALIGNAS(/*alignof(uint64_t)*/ 8) DependentTemplateSpecializationType
+class alignas(8) DependentTemplateSpecializationType
     : public TypeWithKeyword,
       public llvm::FoldingSetNode {
   friend class ASTContext; // ASTContext creates these
diff --git a/clang/include/clang/Basic/SourceManager.h b/clang/include/clang/Basic/SourceManager.h
index 33e63d9..99c36f4 100644
--- a/clang/include/clang/Basic/SourceManager.h
+++ b/clang/include/clang/Basic/SourceManager.h
@@ -92,7 +92,7 @@
   /// One instance of this struct is kept for every file loaded or used.
   ///
   /// This object owns the MemoryBuffer object.
-  class LLVM_ALIGNAS(8) ContentCache {
+  class alignas(8) ContentCache {
     enum CCFlags {
       /// Whether the buffer is invalid.
       InvalidFlag = 0x01,
diff --git a/clang/lib/CodeGen/CGCleanup.h b/clang/lib/CodeGen/CGCleanup.h
index 5530350..93be3e6 100644
--- a/clang/lib/CodeGen/CGCleanup.h
+++ b/clang/lib/CodeGen/CGCleanup.h
@@ -230,7 +230,7 @@
 };
 
 /// A cleanup scope which generates the cleanup blocks lazily.
-class LLVM_ALIGNAS(/*alignof(uint64_t)*/ 8) EHCleanupScope : public EHScope {
+class alignas(8) EHCleanupScope : public EHScope {
   /// The nearest normal cleanup scope enclosing this one.
   EHScopeStack::stable_iterator EnclosingNormal;