Update V8 to r7079 as required by WebKit r80534.

Change-Id: I487c152e485d5a40b68997d7c0d2f1fba5da0834
diff --git a/src/macro-assembler.h b/src/macro-assembler.h
index d261f57..30838bd 100644
--- a/src/macro-assembler.h
+++ b/src/macro-assembler.h
@@ -50,6 +50,13 @@
 };
 
 
+// Types of uncatchable exceptions.
+enum UncatchableExceptionType {
+  OUT_OF_MEMORY,
+  TERMINATION
+};
+
+
 // Invalid depth in prototype chain.
 const int kInvalidProtoDepth = -1;