[ReachingDefAnalysis] Fix management of MBBFrameObjsReachingDefs (#124943) MBBFrameObjsReachingDefs was not being built correctly since we were not inserting into a reference of Frame2InstrIdx. If there was multiple stack slot defs in the same basic block, then the bug would occur. This PR fixes this problem while simplifying the insertion logic. Additionally, when lookup into MBBFrameObjsReachingDefs was occurring, there was a chance that there was no entry in the map, in the case that there was no reaching def. This was causing us to return a default value, which may or may not have been correct. This patch returns the correct value now.
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