Hopefully fix android i386 build after r242554.

That platform has alignof(uint64_t) == 4, but, since LLVM_ALIGNAS(...)
cannot take anything but literal integers due to MSVC limitations, the
literal '8' used there didn't match. Switch ScopeStackAlignment to
just use 8, as well.

llvm-svn: 242578

clang/lib/CodeGen/EHScopeStack.h

@@ -96,7 +96,8 @@ enum CleanupKind : unsigned {
 /// and catch blocks.
 class EHScopeStack {
 public:
-  enum { ScopeStackAlignment = llvm::AlignOf<uint64_t>::Alignment };
+  /* Should switch to alignof(uint64_t) instead of 8, when EHCleanupScope can */
+  enum { ScopeStackAlignment = 8 };
 
   /// A saved depth on the scope stack.  This is necessary because
   /// pushing scopes onto the stack invalidates iterators.