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Fix unused variable warning in LoopFusion pass.

Description

Fix unused variable warning in LoopFusion pass.

Do not wrap the contents of printFusionCandidates in the LLVM_DEBUG macro. This
fixes an unused variable warning generated when compiling without asserts but
with -DENABLE_LLVM_DUMP.

Differential Revision: https://reviews.llvm.org/D61035

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