[clang][deps] Remove -coverage-data-file and -coverage-notes-file from modules

[benlangmuir]

Summary

When not performing codegen, we can strip the coverage-data-file and coverage-notes-file options to improve canonicalization.

rdar://107443796

clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp

ModuleDepCollector::makeInvocationForModuleBuildWithoutOutputs(
   CI.getFrontendOpts().OutputFile.clear();
 
   // TODO: Figure out better way to set options to their default value.
   CI.getCodeGenOpts().MainFileName.clear();
   CI.getCodeGenOpts().DwarfDebugFlags.clear();
   if (!CI.getLangOpts()->ModulesCodegen) {
     CI.getCodeGenOpts().DebugCompilationDir.clear();
     CI.getCodeGenOpts().CoverageCompilationDir.clear();
+    CI.getCodeGenOpts().CoverageDataFile.clear();
+    CI.getCodeGenOpts().CoverageNotesFile.clear();
   }
 
   // Map output paths that affect behaviour to "-" so their existence is in the
   // context hash. The final path will be computed in addOutputPaths.
   if (!CI.getDiagnosticOpts().DiagnosticSerializationFile.empty())
     CI.getDiagnosticOpts().DiagnosticSerializationFile = "-";
   if (!CI.getDependencyOutputOpts().OutputFile.empty())
     CI.getDependencyOutputOpts().OutputFile = "-";

clang/test/ClangScanDeps/Inputs/removed-args/cdb.json.template

 [
   {
     "directory": "DIR",
-    "command": "clang -fsyntax-only DIR/tu.c -fmodules -fimplicit-module-maps -fmodules-validate-once-per-build-session -fbuild-session-file=DIR/build-session -fmodules-prune-interval=123 -fmodules-prune-after=123 -fmodules-cache-path=DIR/cache -include DIR/header.h -grecord-command-line -fdebug-compilation-dir=DIR/debug -fcoverage-compilation-dir=DIR/coverage -o DIR/tu.o -serialize-diagnostics DIR/tu.diag -MT tu -MD -MF DIR/tu.d",
+    "command": "clang -fsyntax-only DIR/tu.c -fmodules -fimplicit-module-maps -fmodules-validate-once-per-build-session -fbuild-session-file=DIR/build-session -fmodules-prune-interval=123 -fmodules-prune-after=123 -fmodules-cache-path=DIR/cache -include DIR/header.h -grecord-command-line -fdebug-compilation-dir=DIR/debug -fcoverage-compilation-dir=DIR/coverage -ftest-coverage -o DIR/tu.o -serialize-diagnostics DIR/tu.diag -MT tu -MD -MF DIR/tu.d",
     "file": "DIR/tu.c"
   }
 ]

clang/test/ClangScanDeps/removed-args.c

 // CHECK-NEXT:   "modules": [
 // CHECK-NEXT:     {
 // CHECK-NEXT:       "clang-module-deps": [],
 // CHECK-NEXT:       "clang-modulemap-file": "[[PREFIX]]/module.modulemap",
 // CHECK-NEXT:       "command-line": [
 // CHECK-NEXT:         "-cc1"
 // CHECK-NOT:          "-fdebug-compilation-dir="
 // CHECK-NOT:          "-fcoverage-compilation-dir="
+// CHECK-NOT:          "-coverage-notes-file
+// CHECK-NOT:          "-coverage-data-file
 // CHECK-NOT:          "-dwarf-debug-flags"
 // CHECK-NOT:          "-main-file-name"
 // CHECK-NOT:          "-include"
 // CHECK-NOT:          "-fmodules-cache-path=
 // CHECK-NOT:          "-fmodules-validate-once-per-build-session"
 // CHECK-NOT:          "-fbuild-session-timestamp=
 // CHECK-NOT:          "-fmodules-prune-interval=
 // CHECK-NOT:          "-fmodules-prune-after=
 // CHECK:            ],
 // CHECK-NEXT:       "context-hash": "[[HASH_MOD_HEADER:.*]]",
 // CHECK-NEXT:       "file-deps": [
 // CHECK-NEXT:         "[[PREFIX]]/mod_header.h",
 // CHECK-NEXT:         "[[PREFIX]]/module.modulemap"
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "name": "ModHeader"
 // CHECK-NEXT:     },
 // CHECK-NEXT:     {
 // CHECK-NEXT:       "clang-module-deps": [],
 // CHECK-NEXT:       "clang-modulemap-file": "[[PREFIX]]/module.modulemap",
 // CHECK-NEXT:       "command-line": [
 // CHECK-NEXT:         "-cc1"
 // CHECK-NOT:          "-fdebug-compilation-dir=
 // CHECK-NOT:          "-fcoverage-compilation-dir=
+// CHECK-NOT:          "-coverage-notes-file
+// CHECK-NOT:          "-coverage-data-file
 // CHECK-NOT:          "-dwarf-debug-flags"
 // CHECK-NOT:          "-main-file-name"
 // CHECK-NOT:          "-include"
 // CHECK-NOT:          "-fmodules-cache-path=
 // CHECK-NOT:          "-fmodules-validate-once-per-build-session"
 // CHECK-NOT:          "-fbuild-session-timestamp=
 // CHECK-NOT:          "-fmodules-prune-interval=
 // CHECK-NOT:          "-fmodules-prune-after=