[cmake] Strip quotes in compiler-rt/lib/crt; error if checks fail

Patch by Zhizhou Yang!

In his own words:

"""
Similar change to CMakeLists as r372312.

After r372209, compiler command line may include argument with quotes:

```
-fprofile-instr-use="/foo/bar.profdata"
```

And it causes a hidden failure with execute_process later: Could not
read profile "/foo/bar.profdata": No such file or directory.

In this particular case, the check for .init_array will fail silently
and creates a PGO-ed binary with bad .init_array section in compiler-rt.

Bug details can be found in PR45022
"""

Differential Revision: https://reviews.llvm.org/D75065

compiler-rt/lib/crt/CMakeLists.txt

@@ -53,6 +53,10 @@ function(check_cxx_section_exists section output)
     endif()
   endforeach()
 
+  # Strip quotes from the compile command, as the compiler is not expecting
+  # quoted arguments (potential quotes added from D62063).
+  string(REPLACE "\"" "" test_compile_command "${test_compile_command}")
+
   string(REPLACE " " ";" test_compile_command "${test_compile_command}")
 
   execute_process(
@@ -62,6 +66,12 @@ function(check_cxx_section_exists section output)
     ERROR_VARIABLE TEST_ERROR
   )
 
+  # Explicitly throw a fatal error message if test_compile_command fails.
+  if(TEST_RESULT)
+    message(FATAL_ERROR "${TEST_ERROR}")
+    return()
+  endif()
+
   execute_process(
     COMMAND ${CMAKE_OBJDUMP} -h "${TARGET_NAME}/CheckSectionExists.o"
     RESULT_VARIABLE CHECK_RESULT