Eliminate the -chained-pch flag and all of the frontend and libclang options associated with it. Chained PCH is the only way to build a PCH file that includes another PCH file

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@138597 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/PCH/chain-trivial.c b/test/PCH/chain-trivial.c
index c78b0e4..85b1eab 100644
--- a/test/PCH/chain-trivial.c
+++ b/test/PCH/chain-trivial.c
@@ -1,4 +1,4 @@
 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-pch -o %t1 %S/Inputs/chain-trivial1.h
-// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-pch -o %t2 -include-pch %t1 -chained-pch %S/Inputs/chain-trivial2.h
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-pch -o %t2 -include-pch %t1 %S/Inputs/chain-trivial2.h
 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -ast-print -include-pch %t2 %s | FileCheck %s
 // CHECK: struct __va_list_tag {