[Test] Provide dead-end blocks to SIL tests.

Via a new method on the dependencies struct.

Author: nate-chandler

include/swift/SIL/Test.h

@@ -108,6 +108,7 @@ class SILFunctionTransform;
 class SILPassManager;
 class DominanceAnalysis;
 class DominanceInfo;
+class DeadEndBlocks;
 
 namespace test {
 
@@ -162,6 +163,9 @@ class FunctionTest final {
   /// Computes and returns the function's dominance tree.
   DominanceInfo *getDominanceInfo();
 
+  /// The function's dead-end blocks.
+  DeadEndBlocks *getDeadEndBlocks();
+
   /// Returns the active pass manager.
   SILPassManager *getPassManager();
 
@@ -254,6 +258,7 @@ class FunctionTest final {
   /// are visible: TestRunner::FunctionTestDependenciesImpl.
   struct Dependencies {
     virtual DominanceInfo *getDominanceInfo() = 0;
+    virtual DeadEndBlocks *getDeadEndBlocks() = 0;
     virtual SILPassManager *getPassManager() = 0;
     virtual SwiftPassInvocation *getSwiftPassInvocation() = 0;
     virtual ~Dependencies(){};

lib/SIL/Utils/Test.cpp

@@ -117,6 +117,10 @@ DominanceInfo *FunctionTest::getDominanceInfo() {
   return dependencies->getDominanceInfo();
 }
 
+DeadEndBlocks *FunctionTest::getDeadEndBlocks() {
+  return dependencies->getDeadEndBlocks();
+}
+
 SILPassManager *FunctionTest::getPassManager() {
   return dependencies->getPassManager();
 }

lib/SILOptimizer/UtilityPasses/TestRunner.cpp

@@ -19,6 +19,7 @@
 
 #include "swift/Basic/Assertions.h"
 #include "swift/SIL/Test.h"
+#include "swift/SILOptimizer/Analysis/DeadEndBlocksAnalysis.h"
 #include "swift/SILOptimizer/Analysis/DominanceAnalysis.h"
 #include "swift/SILOptimizer/PassManager/Transforms.h"
 
@@ -43,6 +44,10 @@ class TestRunner : public SILFunctionTransform {
       auto *dominanceAnalysis = pass->getAnalysis<DominanceAnalysis>();
       return dominanceAnalysis->get(function);
     }
+    DeadEndBlocks *getDeadEndBlocks() override {
+      auto *deadEndBlocksAnalysis = pass->getAnalysis<DeadEndBlocksAnalysis>();
+      return deadEndBlocksAnalysis->get(function);
+    }
     SwiftPassInvocation *getSwiftPassInvocation() override {
       return &swiftPassInvocation;
     }