PR9585: add __decltype as a keyword. While I'm here, alphabetize the list.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@128809 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/TokenKinds.def

@@ -373,18 +373,19 @@ KEYWORD(__pixel                     , KEYALTIVEC)
 
 // Alternate spelling for various tokens.  There are GCC extensions in all
 // languages, but should not be disabled in strict conformance mode.
-ALIAS("__attribute__", __attribute, KEYALL)
-ALIAS("__const"      , const      , KEYALL)
-ALIAS("__const__"    , const      , KEYALL)
 ALIAS("__alignof__"  , __alignof  , KEYALL)
 ALIAS("__asm"        , asm        , KEYALL)
 ALIAS("__asm__"      , asm        , KEYALL)
+ALIAS("__attribute__", __attribute, KEYALL)
 ALIAS("__complex"    , _Complex   , KEYALL)
 ALIAS("__complex__"  , _Complex   , KEYALL)
+ALIAS("__const"      , const      , KEYALL)
+ALIAS("__const__"    , const      , KEYALL)
+ALIAS("__decltype"   , decltype   , KEYCXX)
 ALIAS("__imag__"     , __imag     , KEYALL)
 ALIAS("__inline"     , inline     , KEYALL)
 ALIAS("__inline__"   , inline     , KEYALL)
-ALIAS("__nullptr"    , nullptr      , KEYCXX)
+ALIAS("__nullptr"    , nullptr    , KEYCXX)
 ALIAS("__real__"     , __real     , KEYALL)
 ALIAS("__restrict"   , restrict   , KEYALL)
 ALIAS("__restrict__" , restrict   , KEYALL)

test/SemaCXX/decltype-98.cpp

@@ -0,0 +1,3 @@
+// RUN: %clang_cc1 -std=c++98 -fsyntax-only -verify %s
+extern int x;
+__decltype(1) x = 3;