This change addresses an issue with current compatibility with COFF.
COFF lacks an "Exported" flag. When the COFF object file is generated,
ORC compares the flags from the symbol table in the object file to the
flags it expected from the IR. This was incorrect because when
generating a COFF, the Exported flag was never set. This change ignores
it in asserts. Further, when COFF object file is generated, some symbols
get inserted (for example, if a float is added, it adds a symbol
__real@<HEX OF FLOAT>. This caused issues down the line because more
symbols were being resolved than asked for in the query. This change
makes symbol resolution skip these extra symbols.