[runtime] First step to sanitize regexp literal creation.

src/mips64/macro-assembler-mips64.h

Index: src/mips64/macro-assembler-mips64.h
diff --git a/src/mips64/macro-assembler-mips64.h b/src/mips64/macro-assembler-mips64.h
index 797ddcdfe09aca40d01847aa899d2ad173d2b49c..85cc5b85581d79c7620052875d6591f3efef5d0f 100644
--- a/src/mips64/macro-assembler-mips64.h
+++ b/src/mips64/macro-assembler-mips64.h
@@ -1071,9 +1071,6 @@ class MacroAssembler: public Assembler {
   // Must preserve the result register.
   void PopStackHandler();
 
-  // Copies a fixed number of fields of heap objects from src to dst.
-  void CopyFields(Register dst, Register src, RegList temps, int field_count);
-
   // Copies a number of bytes from src to dst. All registers are clobbered. On
   // exit src and dst will point to the place just after where the last byte was
   // read or written and length will be zero.