ART: String DexCache asm fast path for ARM

In the entrypoints, before a string is looked up in the slow path (in
the intern table), I added assembly to check the dex cache and return a
string pointer if the string is already in the dex cache.

Test: test-art-host

Change-Id: I245946b3efa9c2e4fa56f761effb90963ac22ec4
1 file changed