Use polly optimization

* Polly is always exist in ndk

native/src/main/jni/CMakeLists.txt

@@ -1,7 +1,17 @@
 project(ehviewer)
 cmake_minimum_required(VERSION 3.4.1)
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Oz -fvisibility=hidden -fvisibility-inlines-hidden -ffunction-sections -fdata-sections -flto")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Oz -fvisibility=hidden -fvisibility-inlines-hidden -flto\
+           -mllvm -polly \
+           -mllvm -polly-run-dce \
+		   -mllvm -polly-run-inliner \
+           -mllvm -polly-isl-arg=--no-schedule-serialize-sccs \
+		   -mllvm -polly-ast-use-context \
+           -mllvm -polly-detect-keep-going \
+           -mllvm -polly-position=before-vectorizer \
+		   -mllvm -polly-vectorizer=stripmine \
+           -mllvm -polly-detect-profitability-min-per-loop-insts=40 \
+		   -mllvm -polly-invariant-load-hoisting")
 
 # Build liblzma
 add_subdirectory(liblzma)
@@ -22,6 +32,5 @@ add_subdirectory(image)
 
 # Build and link our app's native lib
 add_library(${PROJECT_NAME} SHARED main.c archive.c)
-target_compile_options(${PROJECT_NAME} PUBLIC -Oz -fvisibility=hidden -fvisibility-inlines-hidden -flto)
 target_include_directories(${PROJECT_NAME} PUBLIC image/image libarchive/libarchive)
 target_link_libraries(${PROJECT_NAME} image archive_static)