Pull in r199188 from upstream clang trunk (by Jakob Stoklund Olesen):

  Puny 24-byte structs are returned by value on SPARC.

  Pad these structs up so they are sret-returned even on that
  architecture.

Introduced here: http://svnweb.freebsd.org/changeset/base/262262

Index: tools/clang/test/CodeGen/sret.c
===================================================================
--- tools/clang/test/CodeGen/sret.c
+++ tools/clang/test/CodeGen/sret.c
@@ -4,6 +4,8 @@ struct abc {
  long a;
  long b;
  long c;
+ long d;
+ long e;
 };
  
 struct abc foo1(void);
Index: tools/clang/test/CodeGen/sret2.c
===================================================================
--- tools/clang/test/CodeGen/sret2.c
+++ tools/clang/test/CodeGen/sret2.c
@@ -4,6 +4,8 @@ struct abc {
  long a;
  long b;
  long c;
+ long d;
+ long e;
 };
  
 struct abc foo2(){}