[clang][ExtractAPI] Emit environment component of target triple in SGF (#103273)

rdar://133533830

Author: daniel-grumberg

clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp

@@ -104,6 +104,10 @@ Object serializePlatform(const Triple &T) {
   Object Platform;
   Platform["architecture"] = T.getArchName();
   Platform["vendor"] = T.getVendorName();
+
+  if (!T.getEnvironmentName().empty())
+    Platform["environment"] = T.getEnvironmentName();
+
   Platform["operatingSystem"] = serializeOperatingSystem(T);
   return Platform;
 }

clang/test/ExtractAPI/platform-serialization.c

@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 -extract-api --pretty-sgf -triple arm64-apple-ios17.1-macabi \
+// RUN:   -x c-header %s -verify -o - | FileCheck %s
+
+int a;
+
+// CHECK:      "platform": {
+// CHECK-NEXT:   "architecture": "arm64",
+// CHECK-NEXT:   "environment": "macabi",
+// CHECK-NEXT:   "operatingSystem": {
+// CHECK-NEXT:     "minimumVersion": {
+// CHECK-NEXT:       "major": 14,
+// CHECK-NEXT:       "minor": 0,
+// CHECK-NEXT:       "patch": 0
+// CHECK-NEXT:     },
+// CHECK-NEXT:     "name": "ios"
+// CHECK-NEXT:   },
+// CHECK-NEXT:   "vendor": "apple"
+// CHECK-NEXT: }
+
+// expected-no-diagnostics