RFR: 8272131: PhaseMacroExpand::generate_slow_arraycopy crash when clone null CallProjections.fallthrough_ioproj

[Hui Shi]

This fix a crash in PhaseMacroExpand::generate_slow_arraycopy in following case, because arraycopy node's fallthrough_ioproj is NULL.
- arraycopy has ArrayIndexOutOfBoundsException exception
- arraycopy is before an infinite loop

Fix is not cloning and replacing fallthrough_ioproj when it is NULL.


    static void foo() {
        try {
            Arrays.copyOfRange(src, -1, 128);
            do {
            } while (true);
        } catch (ArrayIndexOutOfBoundsException ex) {
            count++;
        }
    }


New test is added.
Test: Linux X64 tier1/tier2/tier3 release/fastdebug passed.

-------------

Commit messages:
 - 8272131: PhaseMacroExpand::generate_slow_arraycopy crash when clone null CallProjections.fallthrough_ioproj

Changes: https://git.openjdk.java.net/jdk/pull/5054/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5054&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272131
  Stats: 75 lines in 2 files changed: 71 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5054.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5054/head:pull/5054

PR: https://git.openjdk.java.net/jdk/pull/5054