In the OpenCL mode, the AltiVec mode must be off and checks must be strict

OpenCL is different from AltiVec in the way it supports vector literals.  OpenCL
is strict with regards to semantic checks.  For example, implicit conversions
and explicit casts between vectors of different types are disallowed.

Fixes PR10975. Submitted by: Anton Lokhmotov <Anton.lokhmotov@gmail.com>

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140270 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index a8d98b2..7cb707b 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -1492,9 +1492,9 @@
   // OpenCL has some additional defaults.
   if (LangStd == LangStandard::lang_opencl) {
     Opts.OpenCL = 1;
-    Opts.AltiVec = 1;
+    Opts.AltiVec = 0;
     Opts.CXXOperatorNames = 1;
-    Opts.LaxVectorConversions = 1;
+    Opts.LaxVectorConversions = 0;
     Opts.DefaultFPContract = 1;
   }