[OpenCL] Prevent adding vendor extensions for all targets

Removed extension begin/end pragma as it has no effect and
it is added unconditionally for all targets.

Differential Revision: https://reviews.llvm.org/D92244

Author: Anastasia Stulova

clang/lib/Headers/opencl-c-base.h

@@ -567,7 +567,6 @@ int printf(__constant const char* st, ...) __attribute__((format(printf, 1, 2)))
 #endif
 
 #ifdef cl_intel_device_side_avc_motion_estimation
-#pragma OPENCL EXTENSION cl_intel_device_side_avc_motion_estimation : begin
 
 #define CLK_AVC_ME_MAJOR_16x16_INTEL 0x0
 #define CLK_AVC_ME_MAJOR_16x8_INTEL 0x1
@@ -701,7 +700,6 @@ int printf(__constant const char* st, ...) __attribute__((format(printf, 1, 2)))
 #define CLK_AVC_IME_RESULT_DUAL_REFERENCE_STREAMOUT_INITIALIZE_INTEL 0x0
 #define CLK_AVC_IME_RESULT_DUAL_REFERENCE_STREAMIN_INITIALIZE_INTEL 0x0
 
-#pragma OPENCL EXTENSION cl_intel_device_side_avc_motion_estimation : end
 #endif // cl_intel_device_side_avc_motion_estimation
 
 // Disable any extensions we may have enabled previously.

clang/lib/Headers/opencl-c.h

@@ -23,10 +23,11 @@
 #endif //cl_khr_3d_image_writes
 #endif //__OPENCL_C_VERSION__ < CL_VERSION_2_0
 
-#if defined(__OPENCL_CPP_VERSION__) || (__OPENCL_C_VERSION__ >= CL_VERSION_1_2)
+
+#if (defined(__OPENCL_CPP_VERSION__) || (__OPENCL_C_VERSION__ >= CL_VERSION_1_2)) && defined(__SPIR__)
 #pragma OPENCL EXTENSION cl_intel_planar_yuv : begin
 #pragma OPENCL EXTENSION cl_intel_planar_yuv : end
-#endif // defined(__OPENCL_CPP_VERSION__) || (__OPENCL_C_VERSION__ >= CL_VERSION_1_2)
+#endif // (defined(__OPENCL_CPP_VERSION__) || (__OPENCL_C_VERSION__ >= CL_VERSION_1_2)) && defined(__SPIR__)
 
 #define __ovld __attribute__((overloadable))
 #define __conv __attribute__((convergent))

clang/test/Headers/opencl-c-header.cl

@@ -89,19 +89,17 @@ global atomic_int z = ATOMIC_VAR_INIT(99);
 
 // Check that extension macros are defined correctly.
 
-// FIXME: this should not be defined for all targets
-// Verify that non-builtin cl_intel_planar_yuv extension is defined from
-// OpenCL 1.2 onwards.
+// For SPIR all extensions are supported.
+#if defined(__SPIR__)
+
+// Verify that cl_intel_planar_yuv extension is defined from OpenCL 1.2 onwards.
 #if defined(__OPENCL_CPP_VERSION__) || (__OPENCL_C_VERSION__ >= CL_VERSION_1_2)
 // expected-no-diagnostics
 #else //__OPENCL_C_VERSION__
 // expected-warning@+2{{unknown OpenCL extension 'cl_intel_planar_yuv' - ignoring}}
 #endif //__OPENCL_C_VERSION__
 #pragma OPENCL EXTENSION cl_intel_planar_yuv : enable
 
-// For SPIR all extensions are supported.
-#if defined(__SPIR__)
-
 #if (defined(__OPENCL_CPP_VERSION__) || __OPENCL_C_VERSION__ >= 200)
 
 #if cl_khr_subgroup_extended_types != 1