Optimizations around escape analysis. With tests.

Details:
(1) added new intrinsics
(2) implemented optimizations
      more !can be null information
      more null check removals
      replace return-this uses with incoming parameter
      remove dead StringBuffer/Builder calls (with escape analysis)
(3) Fixed exposed bug in CanBeMoved()

Performance gain:
This improves CafeineString by about 360%
(removes null check from first loop, eliminates second loop completely)

Test: test-art-host

Change-Id: Iaf16a1b9cab6a7386f43d71c6b51dd59600e81c1

1 files changed, 6 insertions, 0 deletions

diff --git a/compiler/optimizing/intrinsics_arm.cc b/compiler/optimizing/intrinsics_arm.cc
index 8234b2467d..8f64faeac0 100644
--- a/compiler/optimizing/intrinsics_arm.cc
+++ b/compiler/optimizing/intrinsics_arm.cc
@@ -2613,6 +2613,12 @@ UNIMPLEMENTED_INTRINSIC(ARM, LongLowestOneBit)
 
 UNIMPLEMENTED_INTRINSIC(ARM, StringStringIndexOf);
 UNIMPLEMENTED_INTRINSIC(ARM, StringStringIndexOfAfter);
+UNIMPLEMENTED_INTRINSIC(ARM, StringBufferAppend);
+UNIMPLEMENTED_INTRINSIC(ARM, StringBufferLength);
+UNIMPLEMENTED_INTRINSIC(ARM, StringBufferToString);
+UNIMPLEMENTED_INTRINSIC(ARM, StringBuilderAppend);
+UNIMPLEMENTED_INTRINSIC(ARM, StringBuilderLength);
+UNIMPLEMENTED_INTRINSIC(ARM, StringBuilderToString);
 
 // 1.8.
 UNIMPLEMENTED_INTRINSIC(ARM, UnsafeGetAndAddInt)