MIPS: Reverted the number of deopt entries to 4096.

On MIPS we cannot double the number of deoptimization entries easily
because the generated code would contain long branches (>128K) and we use
BlockTrampolinePoolScope in the Deoptimizer::TableEntryGenerator::GeneratePrologue method.
Also, we cannot use the Jr instruction here because the Deoptimizer::CreateCode method asserts
that the generated code does not contain reloc information.

BUG=
TEST=
Patch from Daniel Kalmar.
Review URL: http://codereview.chromium.org/9169079

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10514 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/deoptimizer.h

@@ -267,7 +267,11 @@ class Deoptimizer : public Malloced {
   int ConvertJSFrameIndexToFrameIndex(int jsframe_index);
 
  private:
+#ifdef V8_TARGET_ARCH_MIPS
+  static const int kNumberOfEntries = 4096;
+#else
   static const int kNumberOfEntries = 8192;
+#endif
 
   Deoptimizer(Isolate* isolate,
               JSFunction* function,