Issue 21519 - Generate coverage reports for Win64 on Azure

Current coverage report is linux only, this adds reports for Win64.

Win32 is currently excluded because dmd fails the test suite with weird
linker errors when using  coverage build.

.azure-pipelines/windows.sh

@@ -91,13 +91,6 @@ for proj in druntime phobos; do
     "$DM_MAKE" "${LIBS_MAKE_ARGS[@]}"
 done
 
-################################################################################
-# Build and run druntime tests
-################################################################################
-
-cd "$DMD_DIR/../druntime"
-"$DM_MAKE" "${LIBS_MAKE_ARGS[@]}" unittest test_all
-
 ################################################################################
 # Run DMD testsuite
 ################################################################################
@@ -109,6 +102,15 @@ cd ../test
 "$HOST_DC" -m$MODEL -g -i run.d
 ./run tools
 
+# Rebuild dmd with ENABLE_COVERAGE for coverage tests
+if [ "${DMD_TEST_COVERAGE:-0}" = "1" ] ; then
+
+    # Recompile debug dmd + unittests
+    rm -rf "$DMD_DIR/generated/windows"
+    DFLAGS="-L-LARGEADDRESSAWARE" ../generated/build.exe --jobs=$N ENABLE_DEBUG=1 ENABLE_COVERAGE=1 dmd
+    DFLAGS="-L-LARGEADDRESSAWARE" ../generated/build.exe --jobs=$N ENABLE_DEBUG=1 ENABLE_COVERAGE=1 unittest
+fi
+
 if [ "$MODEL" == "32" ] ; then
     # WORKAROUND: Make Optlink use freshly built Phobos, not the host compiler's.
     # Optlink apparently prefers LIB in sc.ini over the LIB env variable (and
@@ -126,6 +128,29 @@ if [ "$HOST_DMD_VERSION" = "2.079.0" ] ; then
 fi
 CC="$CC" ./run --environment --jobs=$N "${targets[@]}" "${args[@]}"
 
+###############################################################################
+# Upload coverage reports and exit if ENABLE_COVERAGE is specified
+################################################################################
+
+if [ "${DMD_TEST_COVERAGE:-0}" = "1" ] ; then
+    cd $DMD_DIR
+    # CodeCov gets confused by lst files which it can't match
+    rm -rf test/runnable/extra-files test/*.lst
+    download "https://codecov.io/bash" "codecov.sh"
+    bash ./codecov.sh -p . -Z
+    rm codecov.sh
+
+    # Skip druntime & phobos tests
+    exit 0
+fi
+
+################################################################################
+# Build and run druntime tests
+################################################################################
+
+cd "$DMD_DIR/../druntime"
+"$DM_MAKE" "${LIBS_MAKE_ARGS[@]}" unittest test_all
+
 ################################################################################
 # Build and run Phobos unittests
 ################################################################################

azure-pipelines.yml

@@ -44,6 +44,29 @@ jobs:
       - template: .azure-pipelines/windows.yml
       - template: .azure-pipelines/windows-artifact.yml
 
+  - job: Windows_Coverage
+    timeoutInMinutes: 120
+    pool:
+      vmImage: 'vs2017-win2016'
+    variables:
+      D_COMPILER: dmd
+      HOST_DMD_VERSION: LATEST
+      DMD_TEST_COVERAGE: 1
+    strategy:
+      matrix:
+        x64:
+          OS: Win_64
+          MODEL: 64
+          ARCH: x64
+
+        # x64 only because 32bit causes weird linker errors for several tests???
+        # x86-OMF:
+        #   OS: Win_32
+        #   MODEL: 32
+        #   ARCH: x86
+    steps:
+      - template: .azure-pipelines/windows.yml
+
   - job: Windows_VisualD_LDC
     timeoutInMinutes: 120
     pool: