Porting of revisions 6639, 6794 and 6805 to the 3.0 branch.

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 73d766a7fcf2d7c06f6e6304f97c05f7aa67e026..bd0e16c21faadc3e251452178b87a27687e1387a 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -662,6 +662,13 @@ class MacroAssembler: public Assembler {
   // Unlink the stack handler on top of the stack from the try handler chain.
   void PopTryHandler();
 
+  // Activate the top handler in the try hander chain and pass the
+  // thrown value.
+  void Throw(Register value);
+
+  // Propagate an uncatchable exception out of the current JS stack.
+  void ThrowUncatchable(UncatchableExceptionType type, Register value);
+
   // ---------------------------------------------------------------------------
   // Inline caching support