MIPS: Fix for 3303 MultithreadedParallelIsolates has a race condition.

src/mips/macro-assembler-mips.h

Index: src/mips/macro-assembler-mips.h
diff --git a/src/mips/macro-assembler-mips.h b/src/mips/macro-assembler-mips.h
index acf62f25b56213162ae65f3ea6db153df7d13957..774449cab8433ecb08f83919f10c2b60383d2810 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -1614,7 +1614,14 @@ const Operand& rt = Operand(zero_reg), BranchDelaySlot bd = PROTECT
 // an assertion to fail.
 class CodePatcher {
  public:
-  CodePatcher(byte* address, int instructions);
+  enum FlushICache {
+    FLUSH,
+    DONT_FLUSH
+  };
+
+  CodePatcher(byte* address,
+              int instructions,
+              FlushICache flush_cache = FLUSH);
   virtual ~CodePatcher();
 
   // Macro assembler to emit code.
@@ -1634,6 +1641,7 @@ class CodePatcher {
   byte* address_;  // The address of the code being patched.
   int size_;  // Number of bytes of the expected patch size.
   MacroAssembler masm_;  // Macro assembler used to generate the code.
+  FlushICache flush_cache_;  // Whether to flush the I cache after patching.
 };