PPC: Remove kind field from StackHandler.

Port 15f82138

Original commit message:
This relands commit 96f79568.

This makes the Isolate::Throw logic not depend on a prediction of
whether an exception is caught or uncaught. Such a prediction is
inherently undecidable because a finally block can decide between
consuming or re-throwing an exception depending on arbitray control
flow.

There still is a conservative prediction mechanism in place that
components like the debugger or tracing can use for reporting.

With this change we can get rid of the StackHandler::kind field, a
pre-requisite to do table-based lookups of exception handlers.

R=mbrandy@us.ibm.com, yangguo@chromium.org, svenpanne@chromium.org

BUG=

Review URL: https://codereview.chromium.org/1016333002

Cr-Commit-Position: refs/heads/master@{#27381}

src/ppc/macro-assembler-ppc.cc

@@ -1097,7 +1097,7 @@ void MacroAssembler::PushTryHandler(StackHandler::Kind kind,
   // For the JSEntry handler, we must preserve r1-r7, r0,r8-r12 are available.
   // We want the stack to look like
   // sp -> NextOffset
-  //       state
+  //       index
   //       context
 
   // Link the current handler as the next handler.
@@ -1107,10 +1107,7 @@ void MacroAssembler::PushTryHandler(StackHandler::Kind kind,
   // Set this new handler as the current one.
   StoreP(sp, MemOperand(r8));
 
-  unsigned state = StackHandler::IndexField::encode(handler_index) |
-                   StackHandler::KindField::encode(kind);
-  LoadIntLiteral(r8, state);
-
+  mov(r8, Operand(handler_index));
   if (kind == StackHandler::JS_ENTRY) {
     LoadSmiLiteral(cp, Smi::FromInt(0));  // Indicates no context.
   }