RFR: aarch32: Another version of SoftFP implementation

[Sergey Nazarkin]

Hi!

Please review alternative version of SoftFP implementation (Interpreter and C1) with VFP support in the soft-float binary[1]. In contrast to [2] we keep assembler unchanged because we believe this improve code readability. 

Another feature is java calling convention that is defined in runtime and depends  on FPU availability. It may improve performance on FPU/SoftFPABI platforms in comparison with traditional C-calling convention. 

webrev: http://cr.openjdk.java.net/~snazarki/softfp/

[1] http://mail.openjdk.java.net/pipermail/aarch32-port-dev/2016-October/000554.html
[2] http://mail.openjdk.java.net/pipermail/aarch32-port-dev/2016-October/000546.html

Sergey Nazarkin