[Swift] Add support for call declarations.

Add Clang support for `call` declarations in Swift.

Author: dan-zheng

include/clang/Index/IndexSymbol.h

@@ -94,6 +94,7 @@ enum class SymbolSubKind : uint8_t {
   SwiftPostfixOperator,
   SwiftInfixOperator,
 
+  SwiftCall,
   SwiftSubscript,
   SwiftAssociatedType,
   SwiftGenericTypeParam,

include/indexstore/indexstore.h

@@ -254,6 +254,7 @@ typedef enum {
   INDEXSTORE_SYMBOL_SUBKIND_SWIFTGENERICTYPEPARAM = 1013,
   INDEXSTORE_SYMBOL_SUBKIND_SWIFTACCESSORREAD = 1014,
   INDEXSTORE_SYMBOL_SUBKIND_SWIFTACCESSORMODIFY = 1015,
+  INDEXSTORE_SYMBOL_SUBKIND_SWIFTCALL = 1016,
 } indexstore_symbol_subkind_t;
 
 typedef enum {

lib/Index/IndexDataStoreUtils.cpp

@@ -386,6 +386,8 @@ indexstore_symbol_subkind_t index::getIndexStoreSubKind(SymbolSubKind K) {
     return INDEXSTORE_SYMBOL_SUBKIND_SWIFTINFIXOPERATOR;
   case SymbolSubKind::SwiftSubscript:
     return INDEXSTORE_SYMBOL_SUBKIND_SWIFTSUBSCRIPT;
+  case SymbolSubKind::SwiftCall:
+    return INDEXSTORE_SYMBOL_SUBKIND_SWIFTCALL;
   case SymbolSubKind::SwiftAssociatedType:
     return INDEXSTORE_SYMBOL_SUBKIND_SWIFTASSOCIATEDTYPE;
   case SymbolSubKind::SwiftGenericTypeParam:

lib/Index/IndexSymbol.cpp

@@ -516,6 +516,7 @@ StringRef index::getSymbolSubKindString(SymbolSubKind K) {
   case SymbolSubKind::SwiftPrefixOperator: return "prefix-operator";
   case SymbolSubKind::SwiftPostfixOperator: return "postfix-operator";
   case SymbolSubKind::SwiftInfixOperator: return "infix-operator";
+  case SymbolSubKind::SwiftCall: return "call";
   case SymbolSubKind::SwiftSubscript: return "subscript";
   case SymbolSubKind::SwiftAssociatedType: return "associated-type";
   case SymbolSubKind::SwiftGenericTypeParam: return "generic-type-param";