Special case the recording of constant pool entries in the slot buffer.

src/a64/assembler-a64.cc

Index: src/a64/assembler-a64.cc
diff --git a/src/a64/assembler-a64.cc b/src/a64/assembler-a64.cc
index 43b1391605f7392ffdd19266061dba9369fd8f66..66a02e0360b2493aad986040744b2ebec39ced8a 100644
--- a/src/a64/assembler-a64.cc
+++ b/src/a64/assembler-a64.cc
@@ -160,6 +160,12 @@ bool RelocInfo::IsCodedSpecially() {
 }
 
 
+bool RelocInfo::IsInConstantPool() {
+  Instruction* instr = reinterpret_cast<Instruction*>(pc_);
+  return instr->IsLdrLiteralX();
+}
+
+
 void RelocInfo::PatchCode(byte* instructions, int instruction_count) {
   // Patch the code at the current address with the supplied instructions.
   Instr* pc = reinterpret_cast<Instr*>(pc_);