Use android reinterpret hash for float as it is faster.

Test: statsd test
Change-Id: I593edac1d7dcd0c5e84195602b42b7c6c3072a38
diff --git a/cmds/statsd/src/HashableDimensionKey.cpp b/cmds/statsd/src/HashableDimensionKey.cpp
index d901bd6..070ad33 100644
--- a/cmds/statsd/src/HashableDimensionKey.cpp
+++ b/cmds/statsd/src/HashableDimensionKey.cpp
@@ -44,8 +44,8 @@
                                                              fieldValue.mValue.str_value)));
                 break;
             case FLOAT: {
-                float floatVal = fieldValue.mValue.float_value;
-                hash = android::JenkinsHashMixBytes(hash, (uint8_t*)&floatVal, sizeof(float));
+                hash = android::JenkinsHashMix(hash,
+                                               android::hash_type(fieldValue.mValue.float_value));
                 break;
             }
         }