Revert "Moves SignatureAnalyzer and ArgumentDescriptor/ResultDescriptor into a separate"

This reverts commit 069612b.

Reverts because it

Breaks compiling the stdlib (optimized, no stdlib assertions), while i try to reproduce and fix.

Author: trentxintong

include/swift/SIL/Projection.h

@@ -832,10 +832,6 @@ class ProjectionTree {
   ProjectionTree(SILModule &Mod, llvm::BumpPtrAllocator &Allocator,
                  SILType BaseTy, ProjectionTreeNode::LivenessKind Kind, 
                  llvm::DenseSet<SILInstruction*> Insts);
-  /// Construct an uninitialized projection tree, which can then be
-  /// initialized by initializeWithExistingTree.
-  ProjectionTree(SILModule &Mod, llvm::BumpPtrAllocator &Allocator) 
-    : Mod(Mod), Allocator(Allocator) {}
   ~ProjectionTree();
   ProjectionTree(const ProjectionTree &) = delete;
   ProjectionTree(ProjectionTree &&) = default;
@@ -846,10 +842,6 @@ class ProjectionTree {
   /// All debug instructions (debug_value, debug_value_addr) are ignored.
   void computeUsesAndLiveness(SILValue Base);
 
-  /// Initialize an empty projection tree with an existing, computed projection
-  /// tree.
-  void initializeWithExistingTree(const ProjectionTree &PT);
-
   /// Create a root SILValue iout of the given leaf node values by walking on
   /// the projection tree.
   SILValue computeExplodedArgumentValue(SILBuilder &Builder,

include/swift/SILOptimizer/Analysis/Analysis.def

@@ -29,7 +29,6 @@ ANALYSIS(ClassHierarchy)
 ANALYSIS(Destructor)
 ANALYSIS(Dominance)
 ANALYSIS(Escape)
-ANALYSIS(FunctionSignature)
 ANALYSIS(InductionVariable)
 ANALYSIS(Loop)
 ANALYSIS(LoopRegion)

include/swift/SILOptimizer/Analysis/FunctionSignatureAnalysis.h

@@ -1172,16 +1172,6 @@ ProjectionTree::~ProjectionTree() {
     N->~ProjectionTreeNode();
 }
 
-void
-ProjectionTree::initializeWithExistingTree(const ProjectionTree &PT) {
-  Kind = PT.Kind;
-  EpilogueReleases = PT.EpilogueReleases;
-  LiveLeafIndices = PT.LiveLeafIndices;
-  for (const auto &N : PT.ProjectionTreeNodes) {
-    ProjectionTreeNodes.push_back(new (Allocator) ProjectionTreeNode(*N));
-  }
-}
-
 SILValue
 ProjectionTree::computeExplodedArgumentValueInner(SILBuilder &Builder,
                                                   SILLocation Loc,

lib/SIL/Projection.cpp

@@ -10,7 +10,6 @@ set(ANALYSIS_SOURCES
   Analysis/DestructorAnalysis.cpp
   Analysis/EscapeAnalysis.cpp
   Analysis/FunctionOrder.cpp
-  Analysis/FunctionSignatureAnalysis.cpp
   Analysis/IVAnalysis.cpp
   Analysis/LoopAnalysis.cpp
   Analysis/LoopRegionAnalysis.cpp