RFR(S): 8209783: AArch64: Combine Multiply and Neg operations in C2

[Pengfei Li]

Hi,

Could you help review this small optimization in AArch64 codegen?

JBS: https://bugs.openjdk.java.net/browse/JDK-8209783
Patch: http://cr.openjdk.java.net/~zyao/8209783/webrev.00/

Note: For Java code patterns a*(-b) or (-a)*b, SubI/SubL nodes are created in ideal graphs to do the ineg/lneg operations.
 
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Thanks,
Pengfei