Reuse boot JNI stub for native methods (reland).

Different native methods can share the same JNI stub as long as they
have the same flag and shorty. Boot images loaded by zygote contain lots
of JNI stubs that already compiled, so we can reuse them for native
methods loaded later. For those methods having a matching JNI stub, we
no longer need the GenericJNI and following JIT/AOT, which will bring an
increase in program speed.

Since there are many optimizations in JniCompile, we can also optimize
the "shorty equals" criteria for some archs to let more methods find
their matching stubs.

Test performance improvement: run a simple addOne(Object, int) native
method for multiple times at startup (microsecond, lower is better):
Number of runs     before        after
5000               398.70        124.94
10000              792.21        234.23
50000              3919.20       1065.30

Test feature coverage: start and run the app for 30 seconds (top 10 apps
in Chinese market, the closer to 100% the better):
(count of native methods that reuse boot JNI stub / total count of app
native methods = percentage)
app1:  1055/1206 = 87.48%
app2:  765/884   = 86.54%
app3:  1267/1414 = 89.60%
app4:  1577/1759 = 89.65%
app5:  1698/1860 = 91.29%
app6:  2528/2787 = 90.71%
app7:  1058/1218 = 86.86%
app8:  952/1092  = 87.18%
app9:  1343/1483 = 90.56%
app10: 2990/3492 = 85.62%

This relands commit c8b6e26aa56bb6761bb781d1095b36f84c4c65d4.

Reason for reland:
- Fix the stack unwind issue of Thumb2.
- We never use AOT code in debuggable. So restrict this optimization
  only to non-debuggable.
- The original CL has conflict with aosp/2988923. That other CL is
  relanded so we can reland after resolving the conflict.

Test: m test-art-host-gtest
Test: run-gtest.sh
Test: testrunner.py --host --all-debuggable
Test: testrunner.py --target --all-debuggable
Bug: 288983053
Change-Id: If7ba92d8a5f4bb9903b407d4f625e085de80cad7

1 files changed, 1 insertions, 1 deletions

diff --git a/compiler/common_compiler_test.h b/compiler/common_compiler_test.h
index 2a1c2d21f1..30d5734ba3 100644
--- a/compiler/common_compiler_test.h
+++ b/compiler/common_compiler_test.h
@@ -84,10 +84,10 @@ class EXPORT CommonCompilerTestImpl {
  protected:
   virtual ClassLinker* GetClassLinker() = 0;
   virtual Runtime* GetRuntime() = 0;
+  class OneCompiledMethodStorage;
 
  private:
   class CodeAndMetadata;
-  class OneCompiledMethodStorage;
 
   std::vector<CodeAndMetadata> code_and_metadata_;
 };