Replace all _LOG error calls with ALOGE.

The debuggerd code sometimes calls _LOG(..., logtype::ERROR, ...)
and sometimes ALOGE(). Standardize on ALOGE since the _LOG message
will wind up in the tombstone in weird places, but using ALOGE
will wind up in the logcat portion of the tombstone.

Bug: 21467089
Change-Id: Ie893f5e91d45b48ef3f5864c3a714e60ac848fb3
diff --git a/debuggerd/backtrace.cpp b/debuggerd/backtrace.cpp
index b8084c5..b46f8f4 100644
--- a/debuggerd/backtrace.cpp
+++ b/debuggerd/backtrace.cpp
@@ -105,7 +105,7 @@
   }
 
   if (!attached && ptrace(PTRACE_DETACH, tid, 0, 0) != 0) {
-    _LOG(log, logtype::ERROR, "ptrace detach from %d failed: %s\n", tid, strerror(errno));
+    ALOGE("ptrace detach from %d failed: %s\n", tid, strerror(errno));
     *detach_failed = true;
   }
 }