[OpenCL] Undefine cl_intel_planar_yuv extension

Summary:

Remove unnecessary definition (otherwise the extension will be defined
where it's not supposed to be defined).

Consider the code:

  #pragma OPENCL EXTENSION cl_intel_planar_yuv : begin
  // some declarations
  #pragma OPENCL EXTENSION cl_intel_planar_yuv : end

is enough for extension to become known for clang.

Patch by: Dmitry Sidorov <dmitry.sidorov@intel.com>

Reviewers: Anastasia, yaxunl

Reviewed By: Anastasia

Tags: #clang

Differential Revision: https://reviews.llvm.org/D58666

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@362398 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Headers/opencl-c.h

@@ -22,9 +22,6 @@
 #endif //__OPENCL_C_VERSION__ < CL_VERSION_2_0
 
 #if __OPENCL_C_VERSION__ >= CL_VERSION_1_2
-#ifndef cl_intel_planar_yuv
-#define cl_intel_planar_yuv
-#endif // cl_intel_planar_yuv
 #pragma OPENCL EXTENSION cl_intel_planar_yuv : begin
 #pragma OPENCL EXTENSION cl_intel_planar_yuv : end
 #endif // __OPENCL_C_VERSION__ >= CL_VERSION_1_2

test/Headers/opencl-c-header.cl

@@ -77,9 +77,6 @@ void test_image3dwo(write_only image3d_t img) {
 // OpenCL 1.2 onwards.
 #if defined(__OPENCL_CPP_VERSION__) || (__OPENCL_C_VERSION__ >= CL_VERSION_1_2)
 // expected-no-diagnostics
-#ifndef cl_intel_planar_yuv
-#error "Missing cl_intel_planar_yuv define"
-#endif
 #else //__OPENCL_C_VERSION__
 // expected-warning@+2{{unknown OpenCL extension 'cl_intel_planar_yuv' - ignoring}}
 #endif //__OPENCL_C_VERSION__

test/SemaOpenCL/extension-begin.cl

@@ -16,6 +16,13 @@
 //
 // RUN: %clang_cc1 -cl-std=CL2.0 -DIMPLICIT_INCLUDE -include %S/extension-begin.h -triple spir-unknown-unknown -O0 -emit-llvm -o - -fmodules -fimplicit-module-maps -fmodules-cache-path=%t.modules %s -verify -pedantic
 
+#pragma OPENCL EXTENSION my_ext : enable
+#ifndef IMPLICIT_INCLUDE
+// expected-warning@-2 {{unknown OpenCL extension 'my_ext' - ignoring}}
+// expected-warning@+2 {{unknown OpenCL extension 'my_ext' - ignoring}}
+#endif // IMPLICIT_INCLUDE
+#pragma OPENCL EXTENSION my_ext : disable
+
 #ifndef IMPLICIT_INCLUDE
 #include "extension-begin.h"
 #endif // IMPLICIT_INCLUDE