[amdgcn] Fix handling of VCC_CONDITIONAL_REG
Classify vcc_lo and vcc_hi into the VCC_CONDITIONAL_REG class, and spill them into SGPRs if necessary. 2019-11-15 Kwok Cheung Yeung <kcy@codesourcery.com> gcc/ * config/gcn/gcn.c (gcn_regno_reg_class): Return VCC_CONDITIONAL_REG register class for VCC_LO and VCC_HI. (gcn_spill_class): Use SGPR_REGS to spill registers in VCC_CONDITIONAL_REG. From-SVN: r278290
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