[assembler] Remove dead {kNoCodeAgeSequenceLength} constant.

R=clemensh@chromium.org

Change-Id: Ife4b31e5484314e3e9d51344c446fae4952bbbbf
Reviewed-on: https://chromium-review.googlesource.com/913616Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51266}

src/arm/assembler-arm.h

@@ -1774,8 +1774,6 @@ class Assembler : public AssemblerBase {
   std::forward_list<HeapObjectRequest> heap_object_requests_;
 };
 
-constexpr int kNoCodeAgeSequenceLength = 3 * Assembler::kInstrSize;
-
 class EnsureSpace BASE_EMBEDDED {
  public:
   INLINE(explicit EnsureSpace(Assembler* assembler));

src/arm64/assembler-arm64.h

@@ -68,7 +68,6 @@ namespace internal {
 // clang-format on
 
 constexpr int kRegListSizeInBits = sizeof(RegList) * kBitsPerByte;
-static const int kNoCodeAgeSequenceLength = 5 * kInstructionSize;
 
 const int kNumRegs = kNumberOfRegisters;
 // Registers x0-x17 are caller-saved.

src/ia32/assembler-ia32-inl.h

@@ -50,9 +50,6 @@ bool CpuFeatures::SupportsOptimizer() { return true; }
 
 bool CpuFeatures::SupportsWasmSimd128() { return IsSupported(SSE4_1); }
 
-static const byte kCallOpcode = 0xE8;
-static const int kNoCodeAgeSequenceLength = 5;
-
 
 // The modes possibly affected by apply must be in kApplyMask.
 void RelocInfo::apply(intptr_t delta) {

src/x64/assembler-x64-inl.h

@@ -23,9 +23,6 @@ bool CpuFeatures::SupportsWasmSimd128() { return IsSupported(SSE4_1); }
 // Implementation of Assembler
 
 
-static const byte kCallOpcode = 0xE8;
-
-
 void Assembler::emitl(uint32_t x) {
   Memory::uint32_at(pc_) = x;
   pc_ += sizeof(uint32_t);

src/x64/assembler-x64.h

@@ -81,9 +81,6 @@ namespace internal {
   V(r14)                                 \
   V(r15)
 
-// The length of pushq(rbp), movp(rbp, rsp), Push(rsi) and Push(rdi).
-constexpr int kNoCodeAgeSequenceLength = kPointerSize == kInt64Size ? 6 : 17;
-
 enum RegisterCode {
 #define REGISTER_CODE(R) kRegCode_##R,
   GENERAL_REGISTERS(REGISTER_CODE)