Fix multi-isolate build:

test/cctest/test-assembler-ia32.cc

Index: test/cctest/test-assembler-ia32.cc
diff --git a/test/cctest/test-assembler-ia32.cc b/test/cctest/test-assembler-ia32.cc
index 1cd2ddc86b96b6fc344782d6113dd0e2f99b3e57..576739b7880fc5ae67bb321a0f48fa56d9785774 100644
--- a/test/cctest/test-assembler-ia32.cc
+++ b/test/cctest/test-assembler-ia32.cc
@@ -345,7 +345,7 @@ TEST(AssemblerIa329) {
   InitializeVM();
   v8::HandleScope scope;
   v8::internal::byte buffer[256];
-  MacroAssembler assm(buffer, sizeof buffer);
+  MacroAssembler assm(Isolate::Current(), buffer, sizeof buffer);
   enum { kEqual = 0, kGreater = 1, kLess = 2, kNaN = 3, kUndefined = 4 };
   Label equal_l, less_l, greater_l, nan_l;
   __ fld_d(Operand(esp, 3 * kPointerSize));