[MIPS] Remove obsolete MacroAssembler::FlushICache.

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 b374d43b797742b54f33bf2b547c23561cf3d776..f69a68f59e3b4c08d0e69303944701ee2cdd71cc 100644
--- a/src/mips64/macro-assembler-mips64.h
+++ b/src/mips64/macro-assembler-mips64.h
@@ -796,11 +796,6 @@ class MacroAssembler: public Assembler {
   // into register dst.
   void LoadFromSafepointRegisterSlot(Register dst, Register src);
 
-  // Flush the I-cache from asm code. You should use CpuFeatures::FlushICache
-  // from C.
-  // Does not handle errors.
-  void FlushICache(Register address, unsigned instructions);
-
   // MIPS64 R2 instruction macro.
   void Ins(Register rt, Register rs, uint16_t pos, uint16_t size);
   void Ext(Register rt, Register rs, uint16_t pos, uint16_t size);