[turbofan] Remove invalid typing rules.

Drop the typing rules for the machine operators and replace them
with UNREACHABLE. These typing rules were never correct and there's
also no need to have those rules at all.

Drive-by-fix: Remove the extremely annoying test-simplified-lowering.cc
file, which is not very useful, but consumes a large amount of time to
keep it compiling and passing. Instead we should introduce appropriate
tests for the SimplifiedLowering that also test something meaningful
w/o just cementing the implementation.

R=jarin@chromium.org
BUG=v8:5267

Review-Url: https://codereview.chromium.org/2292463002
Cr-Commit-Position: refs/heads/master@{#38970}

test/cctest/cctest.gyp

@@ -77,7 +77,6 @@
       'compiler/test-run-stubs.cc',
       'compiler/test-run-variables.cc',
       'compiler/test-run-wasm-machops.cc',
-      'compiler/test-simplified-lowering.cc',
       'cctest.cc',
       'interpreter/interpreter-tester.cc',
       'interpreter/source-position-matcher.cc',

test/cctest/compiler/test-machine-operator-reducer.cc

@@ -83,7 +83,6 @@ class ReducerTester : public HandleAndZoneScope {
         common(main_zone()),
         graph(main_zone()),
         javascript(main_zone()),
-        typer(isolate, &graph),
         jsgraph(isolate, &graph, &common, &javascript, nullptr, &machine),
         maxuint32(Constant<int32_t>(kMaxUInt32)) {
     Node* s = graph.NewNode(common.Start(num_parameters));
@@ -97,7 +96,6 @@ class ReducerTester : public HandleAndZoneScope {
   CommonOperatorBuilder common;
   Graph graph;
   JSOperatorBuilder javascript;
-  Typer typer;
   JSGraph jsgraph;
   Node* maxuint32;
 

test/unittests/compiler/branch-elimination-unittest.cc

@@ -15,7 +15,7 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-class BranchEliminationTest : public TypedGraphTest {
+class BranchEliminationTest : public GraphTest {
  public:
   BranchEliminationTest()
       : machine_(zone(), MachineType::PointerRepresentation(),

test/unittests/compiler/machine-operator-reducer-unittest.cc

@@ -23,10 +23,10 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-class MachineOperatorReducerTest : public TypedGraphTest {
+class MachineOperatorReducerTest : public GraphTest {
  public:
   explicit MachineOperatorReducerTest(int num_parameters = 2)
-      : TypedGraphTest(num_parameters), machine_(zone()) {}
+      : GraphTest(num_parameters), machine_(zone()) {}
 
  protected:
   Reduction Reduce(Node* node) {