[cleanup] Remove some dead MacroAssembler declarations.

R=sigurds@chromium.org

Change-Id: I7df887f84024831b4c55b3468bd54429280dd14e
Reviewed-on: https://chromium-review.googlesource.com/1167054Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54977}

src/arm/macro-assembler-arm.h

@@ -587,13 +587,6 @@ class MacroAssembler : public TurboAssembler {
   // ---------------------------------------------------------------------------
   // GC Support
 
-  // Record in the remembered set the fact that we have a pointer to new space
-  // at the address pointed to by the addr register.  Only works if addr is not
-  // in new space.
-  void RememberedSetHelper(Register object,  // Used for debug code.
-                           Register addr, Register scratch,
-                           SaveFPRegsMode save_fp);
-
   // Check if object is in new space.  Jumps if the object is not in new space.
   // The register scratch can be object itself, but scratch will be clobbered.
   void JumpIfNotInNewSpace(Register object, Register scratch, Label* branch) {

src/ppc/macro-assembler-ppc.h

@@ -678,13 +678,6 @@ class MacroAssembler : public TurboAssembler {
   void IncrementalMarkingRecordWriteHelper(Register object, Register value,
                                            Register address);
 
-  // Record in the remembered set the fact that we have a pointer to new space
-  // at the address pointed to by the addr register.  Only works if addr is not
-  // in new space.
-  void RememberedSetHelper(Register object,  // Used for debug code.
-                           Register addr, Register scratch,
-                           SaveFPRegsMode save_fp);
-
   void JumpToJSEntry(Register target);
   // Check if object is in new space.  Jumps if the object is not in new space.
   // The register scratch can be object itself, but scratch will be clobbered.
@@ -735,11 +728,6 @@ class MacroAssembler : public TurboAssembler {
   void PushSafepointRegisters();
   void PopSafepointRegisters();
 
-  // Flush the I-cache from asm code. You should use CpuFeatures::FlushICache
-  // from C.
-  // Does not handle errors.
-  void FlushICache(Register address, size_t size, Register scratch);
-
   // Enter exit frame.
   // stack_space - extra stack space, used for parameters before call to C.
   // At least one slot (for the return address) should be provided.

src/s390/macro-assembler-s390.h

@@ -653,11 +653,6 @@ class TurboAssembler : public TurboAssemblerBase {
     AddP(kRootRegister, kRootRegister, Operand(kRootRegisterBias));
   }
 
-  // Flush the I-cache from asm code. You should use CpuFeatures::FlushICache
-  // from C.
-  // Does not handle errors.
-  void FlushICache(Register address, size_t size, Register scratch);
-
   // If the value is a NaN, canonicalize the value else, do nothing.
   void CanonicalizeNaN(const DoubleRegister dst, const DoubleRegister src);
   void CanonicalizeNaN(const DoubleRegister value) {
@@ -1273,13 +1268,6 @@ class MacroAssembler : public TurboAssembler {
   void IncrementalMarkingRecordWriteHelper(Register object, Register value,
                                            Register address);
 
-  // Record in the remembered set the fact that we have a pointer to new space
-  // at the address pointed to by the addr register.  Only works if addr is not
-  // in new space.
-  void RememberedSetHelper(Register object,  // Used for debug code.
-                           Register addr, Register scratch,
-                           SaveFPRegsMode save_fp);
-
   void CallJSEntry(Register target);
   static int CallSizeNotPredictableCodeSize(Address target,
                                             RelocInfo::Mode rmode,