Add missing constant

Missed this file in last commit (r4629)

TBR=erik.corry@gmail.com
Review URL: http://codereview.chromium.org/2028007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4630 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/codegen-arm.h

@@ -217,6 +217,9 @@ class CodeGenerator: public AstVisitor {
   // expected arguments. Otherwise return -1.
   static int InlineRuntimeCallArgumentsCount(Handle<String> name);
 
+  // Constants related to patching of inlined lokad/store.
+  static const int kInlinedKeyedLoadInstructionsAfterPatchSize = 19;
+
  private:
   // Construction/Destruction
   explicit CodeGenerator(MacroAssembler* masm);