[assembler] Remove some dead code

Change-Id: I0dc2a198c412723933cb1bc259423ff241612fcc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2098731
Commit-Queue: Georg Neis <neis@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66680}

src/codegen/ppc/assembler-ppc.h

@@ -230,10 +230,6 @@ class Assembler : public AssemblerBase {
     return link(L) - pc_offset();
   }
 
-  // Puts a labels target address at the given position.
-  // The high 8 bits are set to zero.
-  void label_at_put(Label* L, int at_offset);
-
   V8_INLINE static bool IsConstantPoolLoadStart(
       Address pc, ConstantPoolEntry::Access* access = nullptr);
   V8_INLINE static bool IsConstantPoolLoadEnd(

src/codegen/s390/assembler-s390.cc

@@ -580,16 +580,6 @@ void Assembler::next(Label* L) {
   }
 }
 
-bool Assembler::is_near(Label* L, Condition cond) {
-  DCHECK(L->is_bound());
-  if (L->is_bound() == false) return false;
-
-  int maxReach = ((cond == al) ? 26 : 16);
-  int offset = L->pos() - pc_offset();
-
-  return is_intn(offset, maxReach);
-}
-
 int Assembler::link(Label* L) {
   int position;
   if (L->is_bound()) {

src/codegen/s390/assembler-s390.h

@@ -266,17 +266,10 @@ class V8_EXPORT_PRIVATE Assembler : public AssemblerBase {
   // Otherwise, returns the current pc_offset().
   int link(Label* L);
 
-  // Determines if Label is bound and near enough so that a single
-  // branch instruction can be used to reach it.
-  bool is_near(Label* L, Condition cond);
-
   // Returns the branch offset to the given label from the current code position
   // Links the label to the current position if it is still unbound
   int branch_offset(Label* L) { return link(L) - pc_offset(); }
 
-  // Puts a labels target address at the given position.
-  // The high 8 bits are set to zero.
-  void label_at_put(Label* L, int at_offset);
   void load_label_offset(Register r1, Label* L);
 
   // Read/Modify the code target address in the branch/call instruction at pc.