Yusra Syeda b006f55544 [SystemZ/z/OS] Add XPLINK 64-bit calling convention to tablegen. ...

This commit adds the initial changes to the SystemZ target
description for the XPLINK 64-bit calling convention on z/OS.
Additions include:

 - a new predicate IsTargetXPLINK64
 - different register allocation order
 - generaton of nopr after a call

Reviewed-by: uweigand

Differential Revision: https://reviews.llvm.org/D96887

2021-02-19 18:39:49 -05:00

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