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Summary:
D30400 has enabled tADC and tSBC instructions to be unglued, thereby allowing CPSR to remain live between Thumb1 scheduling units.
Most Thumb1 instructions have an OptionalDef for CPSR; but the scheduler ignored the OptionalDefs, and could unwittingly insert a flag-setting instruction in between an ADDS and the corresponding ADC.
Reviewers: javed.absar, atrick, MatzeB, t.p.northover, jmolloy, rengolin
Reviewed By: javed.absar
Subscribers: rogfer01, efriedma, aemerson, rengolin, llvm-commits, MatzeB
Differential Revision: https://reviews.llvm.org/D31081
llvm-svn: 301106
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