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[SPARC] Lower BR_CC to BPr on 64-bit target whenever possible
On 64-bit target, when doing i64 BR_CC where one of the comparison operands is a constant zero, try to fold the compare and BPcc into a BPr instruction. For all integers, EQ and NE comparison are available, additionally for signed integers, GT, GE, LT, and LE is also available. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D142461
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