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Revert "[mlir][ODS] Use StringLiteral instead of StringRef when applicable"

Authored by antiagainst on Feb 4 2021, 10:55 AM.

Description

Revert "[mlir][ODS] Use StringLiteral instead of StringRef when applicable"

This reverts commit 953086ddbb593289fafcf0e7cc6e74847f1635af because
it breaks GCC 5 build:

error: could not convert '(const char*)""' from 'const char*' to 'llvm::StringLiteral'
   static ::llvm::StringLiteral getDialectNamespace() { return ""; }