Use the %llvm-gcc% variable to find llvm-gcc for those of us that don't

have it in our path and to ensure it uses the configured llvm-gcc not just
any one randomly placed in the path.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29522 91177308-0d34-0410-b5e6-96231b3b80d8

test/CFrontend/2006-07-31-PR854.c

@@ -1,4 +1,4 @@
-// RUN: llvm-gcc %s -S -o -
+// RUN: %llvmgcc% %s -S -o -
 // PR854
   struct kernel_symbol {
     unsigned long value;