Fix a long standard problem with clang retaining "too much" sugar 
information about types.  We often print diagnostics where we say 
"foo_t" is bad, but the user doesn't know how foo_t is declared 
(because it is a typedef).  Fix this by expanding sugar when present
in a diagnostic (and not one of a few special cases, like vectors).

Before:
t.m:5:2: error: invalid operands to binary expression ('typeof(P)' and 'typeof(F)')
 MAX(P, F);
 ^~~~~~~~~
t.m:1:78: note: instantiated from:
#define MAX(A,B)    ({ __typeof__(A) __a = (A); __typeof__(B) __b = (B); __a < __b ? __b : __a; })
                                                                             ^

After:
t.m:5:2: error: invalid operands to binary expression ('typeof(P)' (aka 'struct mystruct') and 'typeof(F)' (aka 'float'))
 MAX(P, F);
 ^~~~~~~~~
t.m:1:78: note: instantiated from:
#define MAX(A,B)    ({ __typeof__(A) __a = (A); __typeof__(B) __b = (B); __a < __b ? __b : __a; })
                                                                             ^

llvm-svn: 65081
diff --git a/clang/test/SemaCXX/overloaded-operator-decl.cpp b/clang/test/SemaCXX/overloaded-operator-decl.cpp
index 812ac7f..8008b20 100644
--- a/clang/test/SemaCXX/overloaded-operator-decl.cpp
+++ b/clang/test/SemaCXX/overloaded-operator-decl.cpp
@@ -34,6 +34,6 @@
 typedef float FLOAT;
 Y& operator++(Y&);
 Y operator++(Y&, INT);
-X operator++(X&, FLOAT); // expected-error{{parameter of overloaded post-increment operator must have type 'int' (not 'FLOAT')}}
+X operator++(X&, FLOAT); // expected-error{{parameter of overloaded post-increment operator must have type 'int' (not 'FLOAT' (aka 'float'))}}
 
 int operator+; // expected-error{{'operator+' cannot be the name of a variable or data member}}