Don't build ahat tests with EMMA_INSTRUMENT.

Fixes build failure.

Test: mma, in art/tools/ahat directory
Test: mma EMMA_INSTRUMENT=true, in art/tools/ahat directory
Change-Id: I0c7b5c54eaa18138e1b1c49d9fa54a69030134b6
diff --git a/tools/ahat/Android.mk b/tools/ahat/Android.mk
index 4b3044a..cf31e2e 100644
--- a/tools/ahat/Android.mk
+++ b/tools/ahat/Android.mk
@@ -42,7 +42,9 @@
 
 # The ahat tests rely on running ART to generate a heap dump for test, but ART
 # doesn't run on darwin. Only build and run the tests for linux.
+# There are also issues with running under instrumentation.
 ifeq ($(HOST_OS),linux)
+ifneq ($(EMMA_INSTRUMENT),true)
 # --- ahat-test-dump.jar --------------
 include $(CLEAR_VARS)
 LOCAL_MODULE := ahat-test-dump
@@ -105,6 +107,7 @@
 ahat-test: PRIVATE_AHAT_TEST_JAR := $(AHAT_TEST_JAR)
 ahat-test: $(AHAT_TEST_JAR)
 	java -enableassertions -jar $(PRIVATE_AHAT_TEST_JAR)
+endif # EMMA_INSTRUMENT
 endif # linux
 
 # Clean up local variables.