[assembler] Removed dead {JSCallerSavedCode} and friends.

R=bmeurer@chromium.org

Change-Id: I99013e446635aa4555cf03ebb201a65434542f35
Reviewed-on: https://chromium-review.googlesource.com/918661Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51287}

src/assembler.cc

@@ -1874,22 +1874,5 @@ void Assembler::RequestHeapObject(HeapObjectRequest request) {
   heap_object_requests_.push_front(request);
 }
 
-namespace {
-int caller_saved_codes[kNumJSCallerSaved];
-}
-
-void SetUpJSCallerSavedCodeData() {
-  int i = 0;
-  for (int r = 0; r < kNumRegs; r++)
-    if ((kJSCallerSaved & (1 << r)) != 0) caller_saved_codes[i++] = r;
-
-  DCHECK_EQ(i, kNumJSCallerSaved);
-}
-
-int JSCallerSavedCode(int n) {
-  DCHECK(0 <= n && n < kNumJSCallerSaved);
-  return caller_saved_codes[n];
-}
-
 }  // namespace internal
 }  // namespace v8

src/assembler.h

@@ -59,14 +59,10 @@ namespace internal {
 // Forward declarations.
 class InstructionStream;
 class Isolate;
+class SCTableReference;
 class SourcePosition;
 class StatsCounter;
 
-void SetUpJSCallerSavedCodeData();
-
-// Return the code of the n-th saved register available to JavaScript.
-int JSCallerSavedCode(int n);
-
 // -----------------------------------------------------------------------------
 // Optimization for far-jmp like instructions that can be replaced by shorter.
 
@@ -734,14 +730,8 @@ class RelocIterator: public Malloced {
   DISALLOW_COPY_AND_ASSIGN(RelocIterator);
 };
 
-
 //------------------------------------------------------------------------------
-// External function
-
-//----------------------------------------------------------------------------
-class SCTableReference;
-class Debug_Address;
-
+// External references
 
 // An ExternalReference represents a C++ address used in the generated
 // code. All references to C++ functions and variables must be encapsulated in

src/compiler/x64/code-generator-x64.cc

@@ -595,7 +595,8 @@ void CodeGenerator::AssembleCodeStartRegisterCheck() {
 }
 
 // Check if the code object is marked for deoptimization. If it is, then it
-// jumps to CompileLazyDeoptimizedCode builtin. In order to do this we need to:
+// jumps to the CompileLazyDeoptimizedCode builtin. In order to do this we need
+// to:
 //    1. read from memory the word that contains that bit, which can be found in
 //       the flags in the referenced {CodeDataContainer} object;
 //    2. test kMarkedForDeoptimizationBit in those flags; and

src/v8.cc

@@ -81,7 +81,6 @@ void V8::InitializeOncePerProcessImpl() {
   sampler::Sampler::SetUp();
   CpuFeatures::Probe(false);
   ElementsAccessor::InitializeOncePerProcess();
-  SetUpJSCallerSavedCodeData();
   ExternalReference::SetUp();
   Bootstrapper::InitializeOncePerProcess();
 }