Remove two uses of the gcc specific 'aligned' attribute. This

is partly because this attribute caused trouble in the past (the
SmallVector one had to be changed from aligned to aligned(8) due
to causing crashes on i386 for example; in theory the same might
be needed in the Allocator case...).  But it's mostly because
there seems to be no point in special casing gcc here.  Using the
same implementation for all compilers results in better testing.

llvm-svn: 115462

llvm/include/llvm/ADT/SmallVector.h

@@ -59,17 +59,11 @@ protected:
   // something else.  An array of char would work great, but might not be
   // aligned sufficiently.  Instead, we either use GCC extensions, or some
   // number of union instances for the space, which guarantee maximal alignment.
-  struct U {
-#ifdef __GNUC__
-    char X __attribute__((aligned(8)));
-#else
-    union {
+  union U {
     double D;
     long double LD;
     long long L;
     void *P;
-    } X;
-#endif
   } FirstEl;
   // Space after 'FirstEl' is clobbered, do not add any instance vars after it.
 

llvm/include/llvm/Support/Allocator.h

@@ -221,16 +221,12 @@ public:
 inline void *operator new(size_t Size, llvm::BumpPtrAllocator &Allocator) {
   struct S {
     char c;
-#ifdef __GNUC__
-    char x __attribute__((aligned));
-#else
     union {
       double D;
       long double LD;
       long long L;
       void *P;
     } x;
-#endif
   };
   return Allocator.Allocate(Size, std::min((size_t)llvm::NextPowerOf2(Size),
                                            offsetof(S, x)));