[sil] Split library into subfolders, while still building as a single library still.

Specifically, I split it into 3 initial categories: IR, Utils, Verifier. I just
did this quickly, we can always split it more later if we want.

I followed the model that we use in SILOptimizer: ./lib/SIL/CMakeLists.txt vends
 a macro (sil_register_sources) to the sub-folders that register the sources of
 the subdirectory with a global state variable that ./lib/SIL/CMakeLists.txt
 defines. Then after including those subdirs, the parent cmake declares the SIL
 library. So the output is the same, but we have the flexibility of having
 subdirectories to categorize source files.

lib/SIL/CMakeLists.txt

@@ -1,56 +1,32 @@
+
+set(SIL_SOURCES)
+
+function(_list_transform newvar)
+  set(sources ${ARGN})
+  set(dir ${CMAKE_CURRENT_SOURCE_DIR})
+  set(tmp)
+  foreach (s ${sources})
+    list(APPEND tmp "${dir}/${s}")
+  endforeach()
+  set(${newvar} "${tmp}" PARENT_SCOPE)
+endfunction()
+
+macro(sil_register_sources)
+  precondition(new_transformed_sources
+    NEGATE
+    MESSAGE "Expected this to be empty since we clear after each run")
+  _list_transform(new_transformed_sources ${ARGN})
+  list_union("${SIL_SOURCES}" "${new_transformed_sources}" out)
+  set(SIL_SOURCES "${out}" PARENT_SCOPE)
+  set(new_transformed_sources)
+endmacro()
+
+add_subdirectory(IR)
+add_subdirectory(Utils)
+add_subdirectory(Verifier)
+
 add_swift_host_library(swiftSIL STATIC
-  AbstractionPattern.cpp
-  BasicBlockUtils.cpp
-  Bridging.cpp
-  DebugUtils.cpp
-  Dominance.cpp
-  DynamicCasts.cpp
-  InstructionUtils.cpp
-  MemAccessUtils.cpp
-  Linker.cpp
-  LinearLifetimeChecker.cpp
-  LoopInfo.cpp
-  MemoryLifetime.cpp
-  Notifications.cpp
-  OperandOwnership.cpp
-  OptimizationRemark.cpp
-  OwnershipUtils.cpp
-  PrettyStackTrace.cpp
-  Projection.cpp
-  SIL.cpp
-  SILArgument.cpp
-  SILBasicBlock.cpp
-  SILBuilder.cpp
-  SILConstants.cpp
-  SILCoverageMap.cpp
-  SILDebugScope.cpp
-  SILDeclRef.cpp
-  SILDefaultWitnessTable.cpp
-  SILDifferentiabilityWitness.cpp
-  SILFunction.cpp
-  SILFunctionType.cpp
-  SILGlobalVariable.cpp
-  SILInstruction.cpp
-  SILInstructions.cpp
-  SILInstructionWorklist.cpp
-  SILLocation.cpp
-  SILModule.cpp
-  SILFunctionBuilder.cpp
-  SILOpenedArchetypesTracker.cpp
-  SILPrinter.cpp
-  SILProfiler.cpp
-  SILRemarkStreamer.cpp
-  SILSuccessor.cpp
-  SILType.cpp
-  SILUndef.cpp
-  SILValue.cpp
-  SILVerifier.cpp
-  SILOwnershipVerifier.cpp
-  SILVTable.cpp
-  SILWitnessTable.cpp
-  TypeLowering.cpp
-  ValueOwnership.cpp
-  ValueUtils.cpp)
+  ${SIL_SOURCES})
 target_link_libraries(swiftSIL PRIVATE
   swiftSema
   swiftSerialization)

lib/SIL/IR/CMakeLists.txt

@@ -0,0 +1,35 @@
+sil_register_sources(
+  AbstractionPattern.cpp
+  Bridging.cpp
+  Linker.cpp
+  Notifications.cpp
+  OperandOwnership.cpp
+  SIL.cpp
+  SILArgument.cpp
+  SILBasicBlock.cpp
+  SILBuilder.cpp
+  SILConstants.cpp
+  SILCoverageMap.cpp
+  SILDebugScope.cpp
+  SILDeclRef.cpp
+  SILDefaultWitnessTable.cpp
+  SILDifferentiabilityWitness.cpp
+  SILFunction.cpp
+  SILFunctionBuilder.cpp
+  SILFunctionType.cpp
+  SILGlobalVariable.cpp
+  SILInstruction.cpp
+  SILInstructions.cpp
+  SILLocation.cpp
+  SILModule.cpp
+  SILPrinter.cpp
+  SILProfiler.cpp
+  SILSuccessor.cpp
+  SILType.cpp
+  SILUndef.cpp
+  SILVTable.cpp
+  SILValue.cpp
+  SILWitnessTable.cpp
+  TypeLowering.cpp
+  ValueOwnership.cpp
+)

lib/SIL/IR/OperandOwnership.cpp

@@ -10,7 +10,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "LinearLifetimeCheckerPrivate.h"
 #include "swift/SIL/ApplySite.h"
 #include "swift/SIL/OwnershipUtils.h"
 #include "swift/SIL/SILBuiltinVisitor.h"
@@ -36,7 +35,6 @@ private:
   LLVM_ATTRIBUTE_UNUSED SILModule &mod;
 
   const Operand &op;
-  LinearLifetimeChecker::ErrorBehaviorKind errorBehavior;
   bool checkingSubObject;
 
 public:
@@ -49,9 +47,8 @@ public:
   /// like struct_extract.
   OperandOwnershipKindClassifier(
       SILModule &mod, const Operand &op,
-      LinearLifetimeChecker::ErrorBehaviorKind errorBehavior,
       bool checkingSubObject)
-      : mod(mod), op(op), errorBehavior(errorBehavior),
+      : mod(mod), op(op),
         checkingSubObject(checkingSubObject) {}
 
   bool isCheckingSubObject() const { return checkingSubObject; }
@@ -1050,7 +1047,6 @@ OperandOwnershipKindMap
 Operand::getOwnershipKindMap(bool isForwardingSubValue) const {
   OperandOwnershipKindClassifier classifier(
       getUser()->getModule(), *this,
-      LinearLifetimeChecker::ErrorBehaviorKind::ReturnFalse,
       isForwardingSubValue);
   return classifier.visit(const_cast<SILInstruction *>(getUser()));
 }

lib/SIL/Utils/CMakeLists.txt

@@ -0,0 +1,17 @@
+sil_register_sources(
+  BasicBlockUtils.cpp
+  DebugUtils.cpp
+  Dominance.cpp
+  DynamicCasts.cpp
+  InstructionUtils.cpp
+  LoopInfo.cpp
+  MemAccessUtils.cpp
+  OptimizationRemark.cpp
+  OwnershipUtils.cpp
+  PrettyStackTrace.cpp
+  Projection.cpp
+  SILInstructionWorklist.cpp
+  SILOpenedArchetypesTracker.cpp
+  SILRemarkStreamer.cpp
+  ValueUtils.cpp
+)

lib/SIL/Verifier/CMakeLists.txt

@@ -0,0 +1,6 @@
+sil_register_sources(
+  LinearLifetimeChecker.cpp
+  MemoryLifetime.cpp
+  SILOwnershipVerifier.cpp
+  SILVerifier.cpp
+)