d: Merge upstream dmd 47871363d, druntime, c52e28b7, phobos 99e9c1b77.

d: Merge upstream dmd 47871363d, druntime, c52e28b7, phobos 99e9c1b77.

D front-end changes:

    - Import dmd v2.099.1-beta.1.
    - The address of NRVO variables is now stored in scoped closures
      when they have nested references.
    - Using `__traits(parameters)' in foreach loops now always returns
      the parameters to the function the foreach appears within.
      Previously, when used inside a `foreach' using an overloaded
      `opApply', the trait would yield the parameters to the delegate.
    - The deprecation period of unannotated `asm' blocks has been ended.
    - The `inout' attribute no longer implies the `return' attribute.
    - Added new `D_PreConditions', `D_PostConditions', and
      `D_Invariants' version identifiers.

D runtime changes:

    - Import druntime v2.099.1-beta.1.

Phobos changes:

    - Import phobos v2.099.1-beta.1.
    - `Nullable' in `std.typecons' can now act as a range.
    - std.experimental.logger default level changed to `info' instead of
      `warning'.

gcc/d/ChangeLog:

	* dmd/MERGE: Merge upstream dmd 47871363d.
	* d-builtins.cc (d_init_versions): Add predefined version identifiers
	D_PreConditions, D_PostConditions, and D_Invariants.
	* d-codegen.cc (d_build_call): Update for new front-end interface.
	(build_frame_type): Generate reference field for NRVO variables with
	nested references.
	(build_closure): Generate assignment of return address to closure.
	* d-tree.h (DECL_INSTANTIATED): Use DECL_LANG_FLAG_2.
	(bind_expr): Remove.
	* decl.cc (DeclVisitor::visit (FuncDeclaration *)): Update for new
	front-end interface.
	(get_symbol_decl): Likewise.
	(get_decl_tree): Check DECL_LANG_FRAME_FIELD before DECL_LANG_NRVO.
	Dereference the field when both are set.
	* expr.cc (ExprVisitor::visit (DeleteExp *)): Update for new front-end
	interface.
	* modules.cc (get_internal_fn): Likewise.
	* toir.cc (IRVisitor::visit (ReturnStatement *)): Likewise.

libphobos/ChangeLog:

	* libdruntime/MERGE: Merge upstream druntime c52e28b7.
	* libdruntime/Makefile.am (DRUNTIME_DSOURCES_OPENBSD): Add
	core/sys/openbsd/pwd.d.
	* libdruntime/Makefile.in: Regenerate.
	* src/MERGE: Merge upstream phobos 99e9c1b77.
	* testsuite/libphobos.exceptions/message_with_null.d: New test.

gcc/testsuite/ChangeLog:

	* gdc.dg/nrvo1.d: New test.