RFR: 8282528: AArch64: Incorrect replicate2L_zero rule

[Eric Liu]

This patch fixes the wrong matching rule of replicate2L_zero. It was
matched "ReplicateI" by mistake so that long immediates(not only zero)
had to be moved to register first and matched to replicate2L finally. To
fix this trivial bug, this patch fixes the typo and extends the rule of
replicate2L_zero to replicate2L_imm, which now supports all possible
long immediate values.

The final code changes are shown as below:

replicate2L_imm:

        mov   x13, #0xff
        movk  x13, #0xff, lsl #16
        movk  x13, #0xff, lsl #32
        dup   v16.2d, x13

        =>

        movi  v16.2d, #0xff00ff00ff

[Test]
test/jdk/jdk/incubator/vector, test/hotspot/jtreg/compiler/vectorapi
passed without failure.

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

Commit messages:
 - 8282528: AArch64: Incorrect replicate2L_zero rule

Changes: https://git.openjdk.java.net/jdk/pull/7939/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7939&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282528
  Stats: 408 lines in 5 files changed: 350 ins; 7 del; 51 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7939.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7939/head:pull/7939

PR: https://git.openjdk.java.net/jdk/pull/7939