Bug 1120622 - Define MOZ_SUPPORT_ASSERT_CONDITION_TYPE_VALIDATION for all gcc versions now that we don't support 4.4 any more; r=froydnj

mfbt/Assertions.h

@@ -302,13 +302,8 @@ __declspec(noreturn) __inline void MOZ_NoReturn() {}
  */
 
 #ifdef __cplusplus
-#  if defined(__clang__)
+#  if defined(__clang__) || defined(__GNUC__)
 #    define MOZ_SUPPORT_ASSERT_CONDITION_TYPE_VALIDATION
-#  elif defined(__GNUC__)
-//   B2G GCC 4.4 has insufficient decltype support.
-#    if MOZ_GCC_VERSION_AT_LEAST(4, 5, 0)
-#      define MOZ_SUPPORT_ASSERT_CONDITION_TYPE_VALIDATION
-#    endif
 #  elif defined(_MSC_VER)
 //   Disabled for now because of insufficient decltype support. Bug 1004028.
 #  endif