[NFCI] Clean up idempotent stack pop for inline context (#141544)
In the top-of-tree, the stack pops at L414-416 [1] are no-op since there
are prior stack pops at L400-402.
[1]
https://github.com/llvm/llvm-project/blame/e015626f189dc76f8df9fdc25a47638c6a2f3feb/llvm/lib/ProfileData/SampleProfReader.cpp#L414-L416
[2]
https://github.com/llvm/llvm-project/blame/e015626f189dc76f8df9fdc25a47638c6a2f3feb/llvm/lib/ProfileData/SampleProfReader.cpp#L400-L402