[libclc] Fix merge conflict resolution in CLC native builtins

These should be as in upstream as CLC shouldn't depend on SPIR-V
builtins. The actual SPIR-V versions of these builtins don't call into
CLC at this time anyway. This just looks like a merge conflict resultion
gone awry.

Author: frasercrmck

libclc/clc/lib/generic/math/clc_native_recip.inc

@@ -6,6 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE native_recip(__CLC_GENTYPE val) {
-  return __spirv_ocl_native_recip(val);
+_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE __clc_native_recip(__CLC_GENTYPE val) {
+  return 1.0f / val;
 }

libclc/clc/lib/generic/math/clc_native_rsqrt.inc

@@ -6,6 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE native_rsqrt(__CLC_GENTYPE val) {
-  return __spirv_ocl_native_rsqrt(val);
+_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE __clc_native_rsqrt(__CLC_GENTYPE val) {
+  return 1.0f / __clc_native_sqrt(val);
 }