[Arm]: Fix liveedit support if --enable_ool_constant_pool is true.

If the out of line constant pool is enabled, there is an extra value on the stack frame (the
constant pool pointer).  This change fixes GenerateFrameDropperLiveEdit to pull the function
pointer and pop the stack frame correctly whether or not the constant pool pointer is on the
frame.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/338053003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22084 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/debug-arm.cc

@@ -298,21 +298,26 @@ void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
   __ mov(r1, Operand::Zero());
   __ str(r1, MemOperand(ip, 0));
 
-  // We do not know our frame height, but set sp based on fp.
-  __ sub(sp, fp, Operand(kPointerSize));
+  // Load the function pointer off of our current stack frame.
+  __ ldr(r1, MemOperand(fp,
+         StandardFrameConstants::kConstantPoolOffset - kPointerSize));
 
-  __ Pop(lr, fp, r1);  // Return address, Frame, Function.
+  // Pop return address, frame and constant pool pointer (if
+  // FLAG_enable_ool_constant_pool).
+  __ LeaveFrame(StackFrame::INTERNAL);
 
-  // Load context from the function.
-  __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
+  { ConstantPoolUnavailableScope constant_pool_unavailable(masm);
+    // Load context from the function.
+    __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
 
-  // Get function code.
-  __ ldr(ip, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
-  __ ldr(ip, FieldMemOperand(ip, SharedFunctionInfo::kCodeOffset));
-  __ add(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
+    // Get function code.
+    __ ldr(ip, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
+    __ ldr(ip, FieldMemOperand(ip, SharedFunctionInfo::kCodeOffset));
+    __ add(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
 
-  // Re-run JSFunction, r1 is function, cp is context.
-  __ Jump(ip);
+    // Re-run JSFunction, r1 is function, cp is context.
+    __ Jump(ip);
+  }
 }