cmake: Avoid using if(TARGET x AND TARGET y) (#159707)

This appears to not work, and the documentation only has
examples with a single target checked at a time.

Author: arsenm

llvm/benchmarks/CMakeLists.txt

@@ -14,13 +14,13 @@ add_benchmark(SandboxIRBench SandboxIRBench.cpp PARTIAL_SOURCES_INTENDED)
 add_benchmark(RuntimeLibcallsBench RuntimeLibcalls.cpp PARTIAL_SOURCES_INTENDED)
 
 if(NOT LLVM_TOOL_LLVM_DRIVER_BUILD)
-  # TODO: Check if the tools aer in LLVM_DISTRIBUTION_COMPONENTS with
+  # TODO: Check if the tools are in LLVM_DISTRIBUTION_COMPONENTS with
   # the driver build. Also support the driver build by invoking the
   # tools through llvm-driver
   get_host_tool_path(llvm-nm LLVM_NM llvm_nm_exe llvm_nm_target)
   get_host_tool_path(llc LLC llc_exe llc_target)
 
-  if(TARGET ${llc_target} AND TARGET ${llvm_nm_target})
+  if(${llc_exe} AND ${llvm_nm_exe})
     # Extract the list of symbols in a random utility as sample data.
     set(SYMBOL_TEST_DATA_FILE "sample_symbol_list.txt")
     set(SYMBOL_TEST_DATA_SOURCE_BINARY ${llc_exe})