[CodeGen][GC] Remove GCInfoPrinter

[paperchalice]

This pass is broken and looks like no one uses it.

bool Printer::runOnFunction(Function &F) {
  if (F.hasGC())
    return false;

  GCFunctionInfo *FD = &getAnalysis<GCModuleInfo>().getFunctionInfo(F);

GCFunctionInfo &GCModuleInfo::getFunctionInfo(const Function &F) {
  assert(!F.isDeclaration() && "Can only get GCFunctionInfo for a definition!");
  assert(F.hasGC()); // Equivalent to `assert(false);` when called by `Printer::runOnFunction`

See also #74972.

[MaskRay]

Can you expand the statement "This pass is broken and looks like no one uses it." ? I suspect that it is broken due to the following inverted condition

bool Printer::runOnFunction(Function &F) {
  if (F.hasGC()) ///////
    return false;

[paperchalice]

Can you expand the statement "This pass is broken and looks like no one uses it." ? I suspect that it is broken due to the following inverted condition

bool Printer::runOnFunction(Function &F) {
  if (F.hasGC()) ///////
    return false;

This code triggers the assertion:

llvm-project/llvm/lib/CodeGen/GCMetadata.cpp

Lines 64 to 66 in 2e19760

	GCFunctionInfo &GCModuleInfo::getFunctionInfo(const Function &F) {
	assert(!F.isDeclaration() && "Can only get GCFunctionInfo for a definition!");
	assert(F.hasGC());

No one has noticed it for the last 15 years.

[MaskRay]

This pass is broken and looks like no one uses it.

Thanks. Consider making the commit message/first comment more information how the pass is broken.