document the -march=c option


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11615 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CommandGuide/llc.html b/docs/CommandGuide/llc.html
index 30f8603..3671042 100644
--- a/docs/CommandGuide/llc.html
+++ b/docs/CommandGuide/llc.html
@@ -95,6 +95,9 @@
 
 		<di> sparc
 		<dd>SPARC V9</dd>
+
+		<di> c
+		<dd>Emit C code</dd>
 	</dl>
 	<p>