Add range_inclusive_new

[nsvke]

This patch introduces the 'range_inclusive_new' lang item to the compiler.
When the compiler encounters an inclusive range expression, it now
correctly desugars the operation into a function call targeting this
lang item instead of lowering it directly into a static struct.

gcc/rust/ChangeLog:

* hir/rust-ast-lower-expr.cc (ASTLoweringExpr::visit): Add
desugaring for range_inclusive_new lang item.
* util/rust-lang-item.cc (Rust::LangItem::lang_items): Add
range_inclusive_new to the BiMap.
* util/rust-lang-item.h (class LangItem): Add RANGE_INCLUSIVE_NEW
to the Kind enum.

gcc/testsuite/ChangeLog:

* rust/compile/torture/range-lang-item1.rs: Update test to use
the new lang item.

---

This patch removes the unnecessary HIR::RangeFromToInclExpr class and its
associated visitors across the compiler. Since inclusive ranges are now
directly desugared into a CallExpr targeting the 'range_inclusive_new'
lang item during AST-to-HIR lowering, this HIR node and its
codegen/typecheck implementations are dead code.

gcc/rust/ChangeLog:

* backend/rust-compile-block.h: Remove RangeFromToInclExpr visit.
* backend/rust-compile-expr.cc (CompileExpr::visit): Likewise.
* backend/rust-compile-expr.h: Likewise.
* checks/errors/borrowck/rust-bir-builder-expr-stmt.cc
(ExprStmtBuilder::visit): Likewise.
* checks/errors/borrowck/rust-bir-builder-expr-stmt.h: Likewise.
* checks/errors/borrowck/rust-bir-builder-lazyboolexpr.h:
Likewise.
* checks/errors/borrowck/rust-bir-builder-struct.h: Likewise.
* checks/errors/borrowck/rust-function-collector.h: Likewise.
* checks/errors/privacy/rust-privacy-reporter.cc
(PrivacyReporter::visit): Likewise.
* checks/errors/privacy/rust-privacy-reporter.h: Likewise.
* checks/errors/rust-const-checker.cc (ConstChecker::visit):
Likewise.
* checks/errors/rust-const-checker.h: Likewise.
* checks/errors/rust-hir-pattern-analysis.cc
(PatternChecker::visit): Likewise.
* checks/errors/rust-hir-pattern-analysis.h: Likewise.
* checks/errors/rust-unsafe-checker.cc (UnsafeChecker::visit):
Likewise.
* checks/errors/rust-unsafe-checker.h: Likewise.
* hir/rust-hir-dump.cc (Dump::visit): Likewise.
* hir/rust-hir-dump.h: Likewise.
* hir/tree/rust-hir-expr.cc
(RangeFromToInclExpr::RangeFromToInclExpr): Likewise.
(RangeFromToInclExpr::operator=): Likewise.
* hir/tree/rust-hir-expr.h (class RangeFromToInclExpr): Remove
class.
* hir/tree/rust-hir-full-decls.h (class RangeFromToInclExpr):
Remove forward declaration.
* hir/tree/rust-hir-visitor.cc (DefaultHIRVisitor::walk): Remove
RangeFromToInclExpr visit.
* hir/tree/rust-hir-visitor.h: Likewise.
* hir/tree/rust-hir.cc (RangeFromToInclExpr::to_string): Remove.
(RangeFromToInclExpr::accept_vis): Remove.
* typecheck/rust-hir-type-check-expr.cc (TypeCheckExpr::visit):
Remove.
* typecheck/rust-hir-type-check-expr.h: Remove
RangeFromToInclExpr visit.