[coroutines] Implement unhandled_exception changes.

Summary:
This patch adopts the recent changes that renamed `set_exception(exception_pointer)` to `unhandled_exception()`. 

Additionally `unhandled_exception()` is now required, and so an error is emitted when exceptions are enabled but the promise type does not provide the member.
When exceptions are disabled a warning is emitted instead of an error, The warning notes that the `unhandled_exception()` function is required when exceptions are enabled.

Reviewers: rsmith, GorNishanov, aaron.ballman, majnemer

Reviewed By: GorNishanov

Subscribers: mehdi_amini, cfe-commits

Differential Revision: https://reviews.llvm.org/D30859

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@298565 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 0 deletions

diff --git a/include/clang/Basic/DiagnosticGroups.td b/include/clang/Basic/DiagnosticGroups.td
index 819065f2e9..9f5f9888a8 100644
--- a/include/clang/Basic/DiagnosticGroups.td
+++ b/include/clang/Basic/DiagnosticGroups.td
@@ -36,6 +36,7 @@ def GNUCompoundLiteralInitializer : DiagGroup<"gnu-compound-literal-initializer"
 def BitFieldConstantConversion : DiagGroup<"bitfield-constant-conversion">;
 def BitFieldEnumConversion : DiagGroup<"bitfield-enum-conversion">;
 def BitFieldWidth : DiagGroup<"bitfield-width">;
+def Coroutine : DiagGroup<"coroutine">;
 def ConstantConversion :
   DiagGroup<"constant-conversion", [ BitFieldConstantConversion ] >;
 def LiteralConversion : DiagGroup<"literal-conversion">;