Reland PPC portion of "Detect cache line size on Linux for PPC hosts."

src/ppc/macro-assembler-ppc.cc

Index: src/ppc/macro-assembler-ppc.cc
diff --git a/src/ppc/macro-assembler-ppc.cc b/src/ppc/macro-assembler-ppc.cc
index 2c9aa258721a3ab14b417953aedf704a22fb5574..100ed2f328837674838aa5018ca0d1d7a71fcd3e 100644
--- a/src/ppc/macro-assembler-ppc.cc
+++ b/src/ppc/macro-assembler-ppc.cc
@@ -3453,39 +3453,6 @@ void MacroAssembler::CallCFunctionHelper(Register function,
   }
 }
 
-void MacroAssembler::FlushICache(Register address, size_t size,
-                                 Register scratch) {
-  if (CpuFeatures::IsSupported(INSTR_AND_DATA_CACHE_COHERENCY)) {
-    sync();
-    icbi(r0, address);
-    isync();
-    return;
-  }
-
-  Label done;
-
-  dcbf(r0, address);
-  sync();
-  icbi(r0, address);
-  isync();
-
-  // This code handles ranges which cross a single cacheline boundary.
-  // scratch is last cacheline which intersects range.
-  const int kCacheLineSizeLog2 = WhichPowerOf2(CpuFeatures::cache_line_size());
-
-  DCHECK(size > 0 && size <= (size_t)(1 << kCacheLineSizeLog2));
-  addi(scratch, address, Operand(size - 1));
-  ClearRightImm(scratch, scratch, Operand(kCacheLineSizeLog2));
-  cmpl(scratch, address);
-  ble(&done);
-
-  dcbf(r0, scratch);
-  sync();
-  icbi(r0, scratch);
-  isync();
-
-  bind(&done);
-}
 
 void MacroAssembler::DecodeConstantPoolOffset(Register result,
                                               Register location) {