Fix DevTools CPU profiler after isolates merge.

src/platform-linux.cc

Index: src/platform-linux.cc
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
index 50b0b67d891a3f506fe7243c5d5bc2e92b147423..0624dd97522df40952358af0bec02fca26ee76aa 100644
--- a/src/platform-linux.cc
+++ b/src/platform-linux.cc
@@ -950,6 +950,7 @@ class SignalSender : public Thread {
         }
         Sleep(FULL_INTERVAL);
       }
+      state = SamplerRegistry::GetState();

[Vitaly Repeshko, 2011/03/21 17:16:10]

*Facepalm*

But please fix it in a slightly different way:
SamplerRegistry::State state;
while ((state = SamplerRegistry::GetState()) !=
SamplerRegistry::HAS_NO_SAMPLERS) { ... }

platform-macos.cc also needs to be fixed.

     }
   }