avoid needless throw/catch/rethrow, stringref'ize some simple stuff.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117892 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/CodeGenInstruction.h b/utils/TableGen/CodeGenInstruction.h
index 33701ec..7f9d249 100644
--- a/utils/TableGen/CodeGenInstruction.h
+++ b/utils/TableGen/CodeGenInstruction.h
@@ -190,12 +190,12 @@
     /// getOperandNamed - Return the index of the operand with the specified
     /// non-empty name.  If the instruction does not have an operand with the
     /// specified name, throw an exception.
-    unsigned getOperandNamed(const std::string &Name) const;
+    unsigned getOperandNamed(StringRef Name) const;
 
     /// hasOperandNamed - Query whether the instruction has an operand of the
     /// given name. If so, return true and set OpIdx to the index of the
     /// operand. Otherwise, return false.
-    bool hasOperandNamed(const std::string &Name, unsigned &OpIdx) const;
+    bool hasOperandNamed(StringRef Name, unsigned &OpIdx) const;
 
     /// HasOneImplicitDefWithKnownVT - If the instruction has at least one
     /// implicit def and it has a known VT, return the VT, otherwise return