[Demangler] Add a couple of functions back to the minimal build.

Some of the functions inside the SWIFT_STDLIB_HAS_TYPE_PRINTING conditional
are now needed even in the minimal build as a result of #41452.

rdar://90839754

Author: al45tair

lib/Demangling/NodePrinter.cpp

@@ -14,8 +14,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if SWIFT_STDLIB_HAS_TYPE_PRINTING
-
 #include "swift/Basic/STLExtras.h"
 #include "swift/Demangling/Demangle.h"
 #include "swift/AST/Ownership.h"
@@ -28,12 +26,6 @@ using namespace swift;
 using namespace Demangle;
 using llvm::StringRef;
 
-[[noreturn]]
-static void printer_unreachable(const char *Message) {
-  fprintf(stderr, "fatal error: %s\n", Message);
-  std::abort();
-}
-
 DemanglerPrinter &DemanglerPrinter::operator<<(unsigned long long n) & {
   char buffer[32];
   snprintf(buffer, sizeof(buffer), "%llu", n);
@@ -53,6 +45,14 @@ DemanglerPrinter &DemanglerPrinter::operator<<(long long n) & {
   return *this;
 }
 
+#if SWIFT_STDLIB_HAS_TYPE_PRINTING
+
+[[noreturn]]
+static void printer_unreachable(const char *Message) {
+  fprintf(stderr, "fatal error: %s\n", Message);
+  std::abort();
+}
+
 std::string Demangle::genericParameterName(uint64_t depth, uint64_t index) {
   DemanglerPrinter name;
   do {