Fix incorrect code generation with ENV.

See PR4157 for details. Patch by Martin Nowack!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70973 91177308-0d34-0410-b5e6-96231b3b80d8

test/LLVMC/EnvParentheses.td

@@ -0,0 +1,16 @@
+// Check the fix for PR4157.
+// http://llvm.org/bugs/show_bug.cgi?id=4157
+// RUN: tblgen -I $srcroot/include --gen-llvmc %s -o %t
+// RUN: not grep {)));} %t
+
+include "llvm/CompilerDriver/Common.td"
+
+def dummy_tool : Tool<[
+(cmd_line "gcc -o $OUTFILE $INFILE $ENV(FOO)/bar"),
+(in_language "dummy"),
+(out_language "dummy")
+]>;
+
+def DummyGraph : CompilationGraph<[SimpleEdge<"root", "dummy_tool">]>;
+
+def Graph : CompilationGraph<[]>;