Clean up language and grammar.

Based on a patch by jfcaron3@gmail.com!
PR19806

llvm-svn: 209216
diff --git a/llvm/lib/Support/regengine.inc b/llvm/lib/Support/regengine.inc
index 7e41f96..62d8c26 100644
--- a/llvm/lib/Support/regengine.inc
+++ b/llvm/lib/Support/regengine.inc
@@ -205,7 +205,7 @@
 		if (nmatch == 1 && !g->backrefs)
 			break;		/* no further info needed */
 
-		/* oh my, he wants the subexpressions... */
+		/* oh my, they want the subexpressions... */
 		if (m->pmatch == NULL)
 			m->pmatch = (llvm_regmatch_t *)malloc((m->g->nsub + 1) *
 							sizeof(llvm_regmatch_t));