RFR: 8330936: [ubsan] signed integer overflows in libawt java2d

[Matthias Baesken]

In java2d coding there are a few overflows (those are shown when running jtreg tests with ubsan enabled binaries) 
jtreg test java/awt/Scrollbar/AquaLFScrollbarTest/ScrollBarBorderTest.java shows

jdk/src/java.desktop/share/native/libawt/java2d/loops/TransformHelper.c:683:16: runtime error: signed integer overflow: 1651910497 + 660764199 cannot be represented in type 'int'
    #0 0x7efe59e6ece8 in BilinearInterp src/java.desktop/share/native/libawt/java2d/loops/TransformHelper.c:683
    #1 0x7efe59e75e21 in Java_sun_java2d_loops_TransformHelper_Transform src/java.desktop/share/native/libawt/java2d/loops/TransformHelper.c:499
    #2 0x7efe9b8dee7b (<unknown module>)

java/awt/BasicStroke/DashStrokeTest.java shows

src/java.desktop/share/native/libawt/java2d/pipe/ShapeSpanIterator.c:1366:21: runtime error: signed integer overflow: 128253951 + 2118518271 cannot be represented in type 'int'
    #0 0x7fb97d7daf21 in ShapeSINextSpan src/java.desktop/share/native/libawt/java2d/pipe/ShapeSpanIterator.c:1366
    #1 0x7fb97d62fa7e in AnyIntSetSpans src/java.desktop/share/native/libawt/java2d/loops/AnyInt.c:75
    #2 0x7fb97d6a8816 in Java_sun_java2d_loops_FillSpans_FillSpans src/java.desktop/share/native/libawt/java2d/loops/FillSpans.c:92
    #3 0x7fba12d07e7b (<unknown module>)


There is currently no need seen to adjust this coding, so exclude the methods from ubsan checking to avoid unneeded warnings.

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Commit messages:
 - JDK-8330936

Changes: https://git.openjdk.org/jdk/pull/23255/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23255&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330936
  Stats: 8 lines in 2 files changed: 6 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/23255.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23255/head:pull/23255

PR: https://git.openjdk.org/jdk/pull/23255