[heap] Remove unused MacroAssembler::GetMarkBits.

Bug: chromium:749486
Change-Id: I8dec88b180533548f9eac733790d75ab43f5b743
Reviewed-on: https://chromium-review.googlesource.com/788218Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49619}

src/arm/macro-assembler-arm.h

@@ -870,13 +870,6 @@ class MacroAssembler : public TurboAssembler {
                   Condition cond,  // eq for new space, ne otherwise.
                   Label* branch);
 
-  // Helper for finding the mark bits for an address.  Afterwards, the
-  // bitmap register points at the word with the mark bits and the mask
-  // the position of the first bit.  Leaves addr_reg unchanged.
-  inline void GetMarkBits(Register addr_reg,
-                          Register bitmap_reg,
-                          Register mask_reg);
-
   // Compute memory operands for safepoint stack slots.
   static int SafepointRegisterStackIndex(int reg_code);
 

src/ia32/macro-assembler-ia32.h

@@ -616,13 +616,6 @@ class MacroAssembler : public TurboAssembler {
                   Label* condition_met,
                   Label::Distance condition_met_distance = Label::kFar);
 
-  // Helper for finding the mark bits for an address.  Afterwards, the
-  // bitmap register points at the word with the mark bits and the mask
-  // the position of the first bit.  Uses ecx as scratch and leaves addr_reg
-  // unchanged.
-  inline void GetMarkBits(Register addr_reg, Register bitmap_reg,
-                          Register mask_reg);
-
   // Compute memory operands for safepoint stack slots.
   static int SafepointRegisterStackIndex(int reg_code);
 

src/ppc/macro-assembler-ppc.h

@@ -1034,12 +1034,6 @@ class MacroAssembler : public TurboAssembler {
                   Condition cond,  // eq for new space, ne otherwise.
                   Label* branch);
 
-  // Helper for finding the mark bits for an address.  Afterwards, the
-  // bitmap register points at the word with the mark bits and the mask
-  // the position of the first bit.  Leaves addr_reg unchanged.
-  inline void GetMarkBits(Register addr_reg, Register bitmap_reg,
-                          Register mask_reg);
-
   // Compute memory operands for safepoint stack slots.
   static int SafepointRegisterStackIndex(int reg_code);
 

src/x64/macro-assembler-x64.h

@@ -939,14 +939,6 @@ class MacroAssembler : public TurboAssembler {
                   Label* branch,
                   Label::Distance distance = Label::kFar);
 
-  // Helper for finding the mark bits for an address.  Afterwards, the
-  // bitmap register points at the word with the mark bits and the mask
-  // the position of the first bit.  Uses rcx as scratch and leaves addr_reg
-  // unchanged.
-  inline void GetMarkBits(Register addr_reg,
-                          Register bitmap_reg,
-                          Register mask_reg);
-
   // Compute memory operands for safepoint stack slots.
   static int SafepointRegisterStackIndex(int reg_code) {
     return kNumSafepointRegisters - kSafepointPushRegisterIndices[reg_code] - 1;