[AVR] Fix a bug in prologue of ISR
The r1 register should be cleared in prologue of ISR as it is used as constant zero. Reviewed By: dylanmckay Differential Revision: https://reviews.llvm.org/D99467
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The r1 register should be cleared in prologue of ISR as it is used as constant zero. Reviewed By: dylanmckay Differential Revision: https://reviews.llvm.org/D99467