Reapply "Lazy deopt without code patching."

runtime/vm/instructions_arm64.cc

Index: runtime/vm/instructions_arm64.cc
diff --git a/runtime/vm/instructions_arm64.cc b/runtime/vm/instructions_arm64.cc
index 60ef9bff42f0c82bc1dc047ca303aaa3c83fbda0..3bd5c3fb8d32f51e9c093dc0083a41b3943e9ce5 100644
--- a/runtime/vm/instructions_arm64.cc
+++ b/runtime/vm/instructions_arm64.cc
@@ -333,30 +333,6 @@ void CallPattern::SetTargetCode(const Code& target) const {
 }
 
 
-void CallPattern::InsertDeoptCallAt(uword pc, uword target_address) {
-  Instr* movz0 = Instr::At(pc + (0 * Instr::kInstrSize));
-  Instr* movk1 = Instr::At(pc + (1 * Instr::kInstrSize));
-  Instr* movk2 = Instr::At(pc + (2 * Instr::kInstrSize));
-  Instr* movk3 = Instr::At(pc + (3 * Instr::kInstrSize));
-  Instr* blr = Instr::At(pc + (4 * Instr::kInstrSize));
-  const uint32_t w0 = Utils::Low32Bits(target_address);
-  const uint32_t w1 = Utils::High32Bits(target_address);
-  const uint16_t h0 = Utils::Low16Bits(w0);
-  const uint16_t h1 = Utils::High16Bits(w0);
-  const uint16_t h2 = Utils::Low16Bits(w1);
-  const uint16_t h3 = Utils::High16Bits(w1);
-
-  movz0->SetMoveWideBits(MOVZ, IP0, h0, 0, kDoubleWord);
-  movk1->SetMoveWideBits(MOVK, IP0, h1, 1, kDoubleWord);
-  movk2->SetMoveWideBits(MOVK, IP0, h2, 2, kDoubleWord);
-  movk3->SetMoveWideBits(MOVK, IP0, h3, 3, kDoubleWord);
-  blr->SetUnconditionalBranchRegBits(BLR, IP0);
-
-  ASSERT(kDeoptCallLengthInBytes == 5 * Instr::kInstrSize);
-  CPU::FlushICache(pc, kDeoptCallLengthInBytes);
-}
-
-
 SwitchableCallPattern::SwitchableCallPattern(uword pc, const Code& code)
     : object_pool_(ObjectPool::Handle(code.GetObjectPool())),
       data_pool_index_(-1),