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Upstream several ClangIR-specific MLIR attributes, in particular attributes for integer, floating-point, and null pointer constants. These are the first ClangIR attributes to be upstreamed, so infrastructure changes are included, such as the table-gen file `CIRAttrs.td`. Attributes can be used as the initial values for global variables. The existing automated test global-var-simple.cpp includes initial values for some of the global variables in the test.