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Will make libdvm / libart diffs easier to digest.

Change-Id: I2e119aa8424a2f4ce82a152efbec78bc79d9cc06

It must return null whenever getSuperclass() does.

bug: 10918616
Change-Id: Ief316f84516052b3234b6bbd51ed843aff915026

These methods used equals() comparisons where identity
checks would've sufficient. As expected, this results in a
small but measurable performance increase on both art
& dalvik.

---------------------- After --------------
ART:
    arrayLength    benchmark      us linear runtime
              1 DeepHashCode    8.08 =
              1       Equals   17.68 =
              4 DeepHashCode    8.63 =
              4       Equals   18.20 =
             16 DeepHashCode   19.59 =
             16       Equals   41.19 =
            256 DeepHashCode  255.41 =
            256       Equals  483.61 ==
           2048 DeepHashCode 2321.91 ==============
           2048       Equals 4932.40 ==============================
Dalvik:
    arrayLength    benchmark      us linear runtime
              1 DeepHashCode    32.7 =
              1       Equals    65.3 =
              4 DeepHashCode    34.4 =
              4       Equals    67.7 =
             16 DeepHashCode    76.0 =
             16       Equals   142.8 =
            256 DeepHashCode   755.6 =
            256       Equals  1515.6 ===
           2048 DeepHashCode  6915.4 ===============
           2048       Equals 13786.6 ==============================

------------------------ Before --------------------
Art:
    arrayLength    benchmark      us linear runtime
              1 DeepHashCode    8.13 =
              1       Equals   17.86 =
              4 DeepHashCode    8.63 =
              4       Equals   18.92 =
             16 DeepHashCode   19.59 =
             16       Equals   40.89 =
            256 DeepHashCode  253.88 =
            256       Equals  477.02 ==
           2048 DeepHashCode 2795.26 ================
           2048       Equals 4962.11 ==============================

Dalvik:
    arrayLength    benchmark      us linear runtime
              1 DeepHashCode    32.8 =
              1       Equals    66.7 =
              4 DeepHashCode    34.4 =
              4       Equals    70.1 =
             16 DeepHashCode    74.1 =
             16       Equals   147.9 =
            256 DeepHashCode   805.0 =
            256       Equals  1573.2 ===
           2048 DeepHashCode  7253.4 ===============
           2048       Equals 14349.8 ==============================

bug: 9320068

Change-Id: Id73bf38dd0777b2ec9004a2941523d082bbc74c9

bug: 11666814
Change-Id: I25dc56f5e50e0cfb14e5781e953115864be612a9

bug: https://code.google.com/p/android/issues/detail?id=61993

Change-Id: I1725808187f23ddaa6ab1d14348c3b7702a5f833

The main improvement is that we're vastly reducing
the amount of garbage this method creates.

Also, get rid of some incorrect checks and add a new
benchmark test case.

Before vs. After:

URI                            Equals     1540.1 =
URI EqualsWithHeavilyEscapedComponent 11921397.1 ==============================

URI                            Equals     1337.2 =
URI EqualsWithHeavilyEscapedComponent   588934.3 ==============================

Change-Id: I9ddb87b8267f0ac6a3ac85c2989cc0dd305ef6a1

Add additional documentation where necessary.

bug: 11666814
Change-Id: I622d180c89f835e9466c7efe8f6a079c2516b73f

Addresses review comments from :

https://android-review.googlesource.com/#/c/70041

Change-Id: Idcb799a24f3ea63fa0fc6702f7c7c55f3a1a9b48

Adding a non-comparable key to the set will
throw an exception.

Change-Id: Ie3474f657c45891671b8fd1e10cea5a75c9179dc

This reverts commit d5e28174.

The makefile issue that caused the original build break
has been resolved.

Some of these are needed so that LinkAddress can tell if an
IP address is duplicate, tentative, etc. or if it usable. While
we're at it, add all the ones that are defined in the kernel
headers.

Bug: 9180552
Change-Id: I5fc77cacf5df2249bcf08071430675204624916f

Change-Id: I450b13e714cf68310bf53e2fe740e9ecaac44576

This reverts commit 81bf28ad.

Breaks build

Change-Id: I3f1562921ffe8fdbec36971dd65db398c27c92db

The vast majority of cleaned up harmony tests
are now in harmony-tests/src/test/org/apache/harmony/tests/

Change-Id: I56c2e484ff434b5618cf6751d602ae9f0db96b30

Harmony was never consistent about where they put their
tests. There's no reason we have to be the same.

Also, there's no need to have separate subtrees for nio,
nio_char etc. etc.

This change makes all existing apache harmony tests
subpackages of "org.apache.harmony.tests" and put them under
libcore/harmony-tests.

We somehow managed to end up with two vastly different
copies of CharsetDecoderTest & CharsetEncoderTest. I've
renamed the copies CharsetDecoder2Test & CharsetEncoder2Test
to avoid having to go in and resolve the complicated
diffs or speculate about the reasons for their
divergence.

Change-Id: Ic34e69c2faab8893edd54e05eccd7091f4a09abd