IAR: Pass source file to C-STAT co-compile analysis

The <LANG>_ICSTAT co-compile appended --source= only when another
linter (tidy/cpplint/cppcheck/pvs) was also active, so a C-STAT-only
target ran `icstat analyze "" -- ...` with an empty file argument.
Add icstat to the --source= condition so C-STAT gets the real path.

Fixes: #28045

Source/cmCommonTargetGenerator.cxx

@@ -624,7 +624,7 @@ std::string cmCommonTargetGenerator::GenerateCodeCheckRules(
         cmStrCat(icstat, checksParam, dbParam));
     }
     if (cmNonempty(tidy) || (cmNonempty(cpplint)) || (cmNonempty(cppcheck)) ||
-        cmNonempty(pvs)) {
+        cmNonempty(pvs) || cmNonempty(icstat)) {
       code_check += " --source=";
       code_check +=
         this->GeneratorTarget->GetLocalGenerator()->ConvertToOutputFormat(

Tests/RunCMake/IAR/iar-c-build-stdout.txt

@@ -1 +1,2 @@
-Warning: C-STAT static analysis reported diagnostics.*Severity
+Warning: C-STAT static analysis reported diagnostics.*C-STAT analyze source: [^
+]*module\.c.*Severity

Tests/RunCMake/IAR/iar-cxx-build-stdout.txt

@@ -1 +1,2 @@
-Warning: C-STAT static analysis reported diagnostics.*Severity
+Warning: C-STAT static analysis reported diagnostics.*C-STAT analyze source: [^
+]*module\.cxx.*Severity

Tests/RunCMake/pseudo_icstat.c

@@ -6,13 +6,18 @@ int main(int argc, char* argv[])
 {
   int i;
   int result = 0;
+  char const* source = "";
   for (i = 1; i < argc; ++i) {
     if (strcmp(argv[i], "-bad") == 0) {
       fprintf(stdout, "stdout from bad command line arg '-bad'\n");
       fprintf(stderr, "stderr from bad command line arg '-bad'\n");
       return 1;
     }
+    if (strcmp(argv[i], "analyze") == 0 && i + 1 < argc) {
+      source = argv[++i];
+    }
   }
+  fprintf(stderr, "C-STAT analyze source: %s\n", source);
   fprintf(stderr,
           "\"foo/bar.c\",2 Severity-High[SPC-uninit-var-some]:"
           "Variable `i' may be uninitialized.\n\n");