all: add LLVM 22 support

Builder:
- Update clang.cpp for LLVM 22 API changes: DiagnosticOptions is no
  longer ref-counted, TextDiagnosticPrinter and DiagnosticsEngine take
  references instead of pointers, createDiagnostics() signature changed.
- Update cc1as.cpp: clang/Driver/Options.h moved to
  clang/Options/Options.h, namespace changed from clang::driver::options
  to clang::options, MCInstPrinter now passed as unique_ptr.
- Add new LLVM 22 libraries to GNUmakefile: clangAnalysisLifetimeSafety,
  clangOptions, LLVMDTLTO, and dtlto component.
- Add llvm22 build tag to all build/test commands.

CGo:
- Handle CXType_Unexposed in libclang.go by resolving via canonical
  type. LLVM 22 reports builtin type aliases (e.g. __size_t) as
  Unexposed instead of Typedef.
- Always make C typedefs into Go type aliases. LLVM 22 changed
  getTypedefDeclUnderlyingType to return CXType_Enum directly instead
  of wrapping in an elaborated type.

Compileopts:
- Add build-tag-guarded ClangTriple() to substitute wasm32-unknown-wasi
  with wasm32-unknown-wasip1 for LLVM 22 (deprecated triple).
- Add build-tag-guarded patchFeatures() to map renamed Xtensa features
  (atomctl, memctl, timerint, esp32s3) for LLVM 22.

Targets:
- Remove -zca from RISC-V target feature strings (esp32c3, esp32c6,
  fe310, k210, riscv-qemu, tkey). LLVM 22 now implies +zca from +c.
- Remove -zcd from k210. LLVM 22 now implies +zcd from +c,+d.

Tests:
- Change TestClangAttributes to check individual feature flags instead
  of exact string match, allowing new LLVM features without failures.
- Update TestBinarySize expected values for LLVM 22 codegen.

Signed-off-by: deadprogram <ron@hybridgroup.com>

builder/clang.cpp

@@ -27,9 +27,9 @@ bool tinygo_clang_driver(int argc, char **argv) {
 	std::vector<const char*> args(argv, argv + argc);
 
 	// The compiler invocation needs a DiagnosticsEngine so it can report problems
-	llvm::IntrusiveRefCntPtr<clang::DiagnosticOptions> DiagOpts = new clang::DiagnosticOptions();
-	clang::TextDiagnosticPrinter DiagnosticPrinter(llvm::errs(), &*DiagOpts);
-	clang::DiagnosticsEngine Diags(llvm::IntrusiveRefCntPtr<clang::DiagnosticIDs>(new clang::DiagnosticIDs()), &*DiagOpts, &DiagnosticPrinter, false);
+	clang::DiagnosticOptions DiagOpts;
+	clang::TextDiagnosticPrinter DiagnosticPrinter(llvm::errs(), DiagOpts);
+	clang::DiagnosticsEngine Diags(llvm::IntrusiveRefCntPtr<clang::DiagnosticIDs>(new clang::DiagnosticIDs()), DiagOpts, &DiagnosticPrinter, false);
 
 	// Create the clang driver
 	clang::driver::Driver TheDriver(args[0], llvm::sys::getDefaultTargetTriple(), Diags);
@@ -60,7 +60,7 @@ bool tinygo_clang_driver(int argc, char **argv) {
 			}
 
 			// Create the actual diagnostics engine.
-			Clang->createDiagnostics(*llvm::vfs::getRealFileSystem());
+			Clang->createDiagnostics();
 			if (!Clang->hasDiagnostics()) {
 				return false;
 			}