Implement !if, analogous to $(if) in GNU make.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71815 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/TGLexer.cpp b/utils/TableGen/TGLexer.cpp
index faf1e75..758d499 100644
--- a/utils/TableGen/TGLexer.cpp
+++ b/utils/TableGen/TGLexer.cpp
@@ -453,6 +453,7 @@
if (Len == 3 && !memcmp(Start, "car", 3)) return tgtok::XCar;
if (Len == 3 && !memcmp(Start, "cdr", 3)) return tgtok::XCdr;
if (Len == 4 && !memcmp(Start, "null", 4)) return tgtok::XNull;
+ if (Len == 2 && !memcmp(Start, "if", 2)) return tgtok::XIf;
return ReturnError(Start-1, "Unknown operator");
}