[offload] - If LIBOMPTARGET_NO_SANITIZER_AMDGPU is set turn of SANITIZER_AMDGPU

When building compiler-rt as a runtime and also setting
-DSANITIZER_AMDGPU=1 will propagate this variable down to
the runtime CMakeCache.txt. We don't necessarily want
the sanitizer enabled for offload in this case.

Change-Id: I5608975bdd5c18689b65d2881fcba5f0cb245eea

Author: estewart08

offload/CMakeLists.txt

@@ -19,6 +19,10 @@ else()
   set(OPENMP_STANDALONE_BUILD FALSE)
 endif()
 
+if(LIBOMPTARGET_NO_SANITIZER_AMDGPU)
+  set(SANITIZER_AMDGPU FALSE)
+endif()
+
 # Check that the library can actually be built.
 if(APPLE OR WIN32 OR WASM)
   message(WARNING "libomptarget cannot be built on Windows and MacOS X!")