[PM] Introduce CRTP mixin base classes to help define passes and

analyses in the new pass manager.

These just handle really basic stuff: turning a type name into a string
statically that is nice to print in logs, and getting a static unique ID
for each analysis.

Sadly, the format of passes in anonymous namespaces makes using their
names in tests really annoying so I've customized the names of the no-op
passes to keep tests sane to read.

This is the first of a few simplifying refactorings for the new pass
manager that should reduce boilerplate and confusion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262004 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/CGSCCPassManager.cpp

@@ -13,8 +13,6 @@
 
 using namespace llvm;
 
-char CGSCCAnalysisManagerModuleProxy::PassID;
-
 CGSCCAnalysisManagerModuleProxy::Result
 CGSCCAnalysisManagerModuleProxy::run(Module &M) {
   assert(CGAM->empty() && "CGSCC analyses ran prior to the module proxy!");
@@ -44,10 +42,6 @@ bool CGSCCAnalysisManagerModuleProxy::Result::invalidate(
   return false;
 }
 
-char ModuleAnalysisManagerCGSCCProxy::PassID;
-
-char FunctionAnalysisManagerCGSCCProxy::PassID;
-
 FunctionAnalysisManagerCGSCCProxy::Result
 FunctionAnalysisManagerCGSCCProxy::run(LazyCallGraph::SCC &C) {
   return Result(*FAM);
@@ -75,5 +69,3 @@ bool FunctionAnalysisManagerCGSCCProxy::Result::invalidate(
   // Return false to indicate that this result is still a valid proxy.
   return false;
 }
-
-char CGSCCAnalysisManagerFunctionProxy::PassID;