COFF: Simplify.
COFF: Simplify.

SymbolTable::find(mangle(X)) is equivalent to SymbolTable::findUnderscore(X)
except that the latter is slightly efficient as that doesn't allocate a new
string.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@244377 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld