Change tests to use -opaque-pointers explicitly

Because we're not ready to enable opaque pointers by default yet, we are
keeping them off by default for now. These tests were assuming opaque
pointers are on by default, so they need to be changed to use opaque
pointers explicitly for now.

Author: dwoodwor-intel

clang/test/CodeGen/builtin_Float16.c

@@ -1,7 +1,7 @@
-// RUN: %clang_cc1 -emit-llvm -o - -triple x86_64-linux-pc -target-feature +avx512fp16 %s | FileCheck %s
-// RUN: %clang_cc1 -emit-llvm -o - -triple spir-unknown-unknown %s | FileCheck %s
-// RUN: %clang_cc1 -emit-llvm -o - -triple armv7a--none-eabi %s | FileCheck %s
-// RUN: %clang_cc1 -emit-llvm -o - -triple aarch64-linux-gnu %s | FileCheck %s
+// RUN: %clang_cc1 -opaque-pointers -emit-llvm -o - -triple x86_64-linux-pc -target-feature +avx512fp16 %s | FileCheck %s
+// RUN: %clang_cc1 -opaque-pointers -emit-llvm -o - -triple spir-unknown-unknown %s | FileCheck %s
+// RUN: %clang_cc1 -opaque-pointers -emit-llvm -o - -triple armv7a--none-eabi %s | FileCheck %s
+// RUN: %clang_cc1 -opaque-pointers -emit-llvm -o - -triple aarch64-linux-gnu %s | FileCheck %s
 
 void test_float16_builtins(void) {
   volatile _Float16 res;

clang/test/CodeGenCXX/externc-used-not-replaced.cpp

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple x86_64-windows -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -opaque-pointers -triple x86_64-windows -emit-llvm -o - %s | FileCheck %s
 
 extern "C" {
   const char a __attribute__((used)){};