[X86] Add a blsr test case with a shift from PR35792. NFC
The blsr pattern here is missed because the add is shrunk, but the and is not. This leaves an any_extend between them. llvm-svn: 324986
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The blsr pattern here is missed because the add is shrunk, but the and is not. This leaves an any_extend between them. llvm-svn: 324986