Adapt methods for fast calls

Summary:
Changes all possible native JNI methods to critical methods.

For now, this only changes Android up and including v7. In order to be prepared for the `CriticalNative` annotation in Android v8, the following restrictions apply:

- Qualifying methods must be static (this is also enforced for Dalvik / Android v4)
- Method implementations can only consume primitive JNI types (`boolean`, jchar`, etc.)

Reviewed By: priteshrnandgaonkar

Differential Revision: D9943868

fbshipit-source-id: 728817eb37822b717fd3daf94cd9f02b42c17db6

lib/fb/src/main/cpp/include/fb/fbjni/Registration-inl.h

@@ -183,7 +183,7 @@ inline std::string makeDescriptor(R (C::*)(Args... args)) {
 
 template <typename R, typename... Args>
 template <R (*func)(Args...)>
-R CriticalMethod<R (*)(Args...)>::call(
+JNI_ENTRY_POINT R CriticalMethod<R (*)(Args...)>::call(
     alias_ref<jclass>,
     Args... args) noexcept {
   static_assert(

lib/jni/BUCK

@@ -13,5 +13,6 @@ yoga_cxx_library(
         "real/jni.h",
     ],
     force_static = True,
+    preprocessor_flags = ["-fmacro-backtrace-limit=0"],
     visibility = ["PUBLIC"],
 )