[vectorIntrinsics] RFR: 8264427: StubRoutines::vectorizedMismatch is missing for C1 compiler after JDK-8264321

[Jie Fu]

Hi all,

StubRoutines::vectorizedMismatch [1] is missing for C1 compiler if `#ifdef COMPILER2` is false.

This bug will cause jdk crash while building minimal VM due to the following incorrect code generated by C1.
--------------------------------------------------------------------------------
  74 rtcall StubRoutines::vectorizedMismatch()
--------------------------------------------------------------------------------
  0x00007fffee4f1809:   movabs $0x0,%r10                    ;   {runtime_call}
  0x00007fffee4f1813:   callq  *%r10                        ;*invokestatic vectorizedMismatch {reexecute=0 rethrow=0 return_oop=0}
                                                            ; - jdk.internal.util.ArraysSupport::mismatch at 33 (line 239)

Let's fix it

Thanks.
Best regards,
Jie

[1] https://github.com/openjdk/panama-vector/blob/vectorIntrinsics/src/hotspot/cpu/x86/stubGenerator_x86_64.cpp#L6969

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Commit messages:
 - 8264427: StubRoutines::vectorizedMismatch is missing for C1 compiler after JDK-8264321

Changes: https://git.openjdk.java.net/panama-vector/pull/55/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=55&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264427
  Stats: 7 lines in 1 file changed: 4 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/55.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/55/head:pull/55

PR: https://git.openjdk.java.net/panama-vector/pull/55