[llvm-debuginfo-analyzer] Optimize 'LVNamespaceDeduction::find' funtion.

[CarlosAlbertoEnciso]

Extracted from llvm/tools/llvm-debuginfo-analyzer/README.txt
https://reviews.llvm.org/D125784#inline-1296195

Optimize the 'find' method to use the proposed code:

  LVStringRefs::iterator Iter = std::find_if(Components.begin(), Components.end(),
    [](StringRef Name) {
        return IdentifiedNamespaces.find(Name) == IdentifiedNamespaces.end();
    });
  LVStringRefs::size_type FirstNonNamespace = std::distance(Components.begin(), Iter);

[llvmbot]

@llvm/issue-subscribers-debuginfo

Author: Carlos Alberto Enciso (CarlosAlbertoEnciso)

Extracted from [llvm/tools/llvm-debuginfo-analyzer/README.txt](https://github.com/llvm/llvm-project/blob/main/llvm/tools/llvm-debuginfo-analyzer/README.txt) https://reviews.llvm.org/D125784#inline-1296195

Optimize the 'find' method to use the proposed code:

  LVStringRefs::iterator Iter = std::find_if(Components.begin(), Components.end(),
    [](StringRef Name) {
        return IdentifiedNamespaces.find(Name) == IdentifiedNamespaces.end();
    });
  LVStringRefs::size_type FirstNonNamespace = std::distance(Components.begin(), Iter);