[SIL] NFC: Added debug printing of block ids.

Author: nate-chandler

include/swift/SIL/SILBasicBlock.h

@@ -516,6 +516,17 @@ public SwiftObjectHeader {
 
   void printAsOperand(raw_ostream &OS, bool PrintType = true);
 
+#ifndef NDEBUG
+  /// Print the ID of the block, bbN.
+  void dumpID() const;
+
+  /// Print the ID of the block with \p OS, bbN.
+  void printID(llvm::raw_ostream &OS) const;
+
+  /// Print the ID of the block with \p Ctx, bbN.
+  void printID(SILPrintContext &Ctx) const;
+#endif
+
   /// getSublistAccess() - returns pointer to member of instruction list
   static InstListType SILBasicBlock::*getSublistAccess() {
     return &SILBasicBlock::InstList;

lib/SIL/IR/SILPrinter.cpp

@@ -854,6 +854,12 @@ class SILPrinter : public SILInstructionVisitor<SILPrinter> {
     *this << ')';
   }
 
+#ifndef NDEBUG
+  void printID(const SILBasicBlock *BB) {
+    *this << Ctx.getID(BB) << "\n";
+  }
+#endif
+
   void print(const SILBasicBlock *BB) {
     // Output uses for BB arguments. These are put into place as comments before
     // the block header.
@@ -3086,6 +3092,21 @@ void SILBasicBlock::print(SILPrintContext &Ctx) const {
   SILPrinter(Ctx).print(this);
 }
 
+#ifndef NDEBUG
+void SILBasicBlock::dumpID() const {
+  printID(llvm::errs());
+}
+
+void SILBasicBlock::printID(llvm::raw_ostream &OS) const {
+  SILPrintContext Ctx(OS);
+  printID(Ctx);
+}
+
+void SILBasicBlock::printID(SILPrintContext &Ctx) const {
+  SILPrinter(Ctx).printID(this);
+}
+#endif
+
 /// Pretty-print the SILFunction to errs.
 void SILFunction::dump(bool Verbose) const {
   SILPrintContext Ctx(llvm::errs(), Verbose);