d: Merge upstream dmd, druntime 53a1cc8d13

d: Merge upstream dmd, druntime 53a1cc8d13

D front-end changes:

	- Typesafe variadic class parameters have been deprecated.

D runtime changes:

	- Added `entry' field to TypeInfo_AssociativeArray.

gcc/d/ChangeLog:

	* dmd/MERGE: Merge upstream dmd 53a1cc8d13.
	* d-tree.h (create_typeinfo): Change second parameter to Scope *.
	(speculative_type_p): Remove prototype.
	* d-frontend.cc (getTypeInfoType): Adjust.
	* decl.cc: Include dmd/typinf.h.
	(DeclVisitor::visit (TypeInfoDeclaration *)): Update for new front-end
	interface.
	* typeinfo.cc (create_typeinfo): Likewise.
	(class SpeculativeTypeVisitor): Remove class.
	(speculative_type_p): Remove function.

libphobos/ChangeLog:

	* libdruntime/MERGE: Merge upstream druntime 53a1cc8d13.

gcc/testsuite/ChangeLog:

	* gdc.dg/pr100967.d: Adjust error message.