Try to fix the ASAN build

We want to use the 'just built' compiler for the runtime tests because
of the recently added `swiftasync` parameter support.

But ASAN won't link if we use the 'just built' compiler because libgtest
and LLVMSupport are compiled by the host compiler.

Disable the runtime test when running under ASAN.

rdar://73664504

Author: aschwaighofer

unittests/runtime/CMakeLists.txt

@@ -1,5 +1,10 @@
+# We can't currently build the runtime tests under ASAN
+# The problem is that we want to use the just-build compiler (just like the
+# runtime) but ASAN will complain if we link against libgtest and LLVMSupport
+# libraries because they were compiled with the host compiler.
 if(("${SWIFT_HOST_VARIANT_SDK}" STREQUAL "${SWIFT_PRIMARY_VARIANT_SDK}") AND
-   ("${SWIFT_HOST_VARIANT_ARCH}" STREQUAL "${SWIFT_PRIMARY_VARIANT_ARCH}"))
+  ("${SWIFT_HOST_VARIANT_ARCH}" STREQUAL "${SWIFT_PRIMARY_VARIANT_ARCH}") AND
+  (NOT (LLVM_USE_SANITIZER STREQUAL "Address")))
 
   if("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")
     if(NOT SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER)