[interop] Template instantiation crash when instantiating std::map.count from Swift

[hyp]

Describe the bug
The compiler crashes.

Steps To Reproduce
Test.h:

#include <map>

#define SWIFT_CXX_REF_IMMORTAL                                                                                         \
	__attribute__((swift_attr("import_as_ref")))                                                                         \
  __attribute__((swift_attr("retain:immortal")))                                                                       \
	__attribute__((swift_attr("release:immortal")))

struct SWIFT_CXX_REF_IMMORTAL CxxRecord {
    std::map<int, int> map_;
};

inline CxxRecord * _Nonnull getImmortalCxxRecord() { return new CxxRecord; }

cat module.modulemap

module Testi {
  header "test.h"
  requires cplusplus
}

cat test.swift

import Testi
import std

func test() {
    let value = getImmortalCxxRecord().map_
    value.count(2)
}

Expected behavior
This should not crash.

[hyp]

Crash here:

4  swift-frontend           0x0000000101e732b0 swift::ClangImporter::instantiateCXXFunctionTemplate(swift::ASTContext&, clang::FunctionTemplateDecl*, swift::SubstitutionMap) + 376
5  swift-frontend           0x0000000101e732b0 swift::ClangImporter::instantiateCXXFunctionTemplate(swift::ASTContext&, clang::FunctionTemplateDecl*, swift::SubstitutionMap) + 376
6  swift-frontend           0x0000000101e73728 swift::ClangImporter::getCXXFunctionTemplateSpecialization(swift::SubstitutionMap, swift::ValueDecl*) + 284
7  swift-frontend           0x000000010195e6c4 swift::constraints::Solution::resolveConcreteDeclRef(swift::ValueDecl*, swift::constraints::ConstraintLocator*) const + 284
8  swift-frontend           0x0000000101972fc8 (anonymous namespace)::ExprRewriter::buildMemberRef(swift::Expr*, swift::SourceLoc, swift::constraints::SelectedOverload, swift::DeclNameLoc, swift::constraints::ConstraintLocatorBuilder, swift::constraints::ConstraintLocatorBuilder, bool, swift::AccessSemantics) + 984
9  swift-frontend           0x000000010196eca4 swift::ASTVisitor<(anonymous namespace)::ExprRewriter, swift::Expr*, void, void, void, void, void>::visit(swift::Expr*) + 23620
10 swift-frontend           0x0000000101967074 (anonymous namespace)::ExprWalker::walkToExprPost(swift::Expr*) + 36
11 swift-frontend           0x0000000101fc90ac (anonymous namespace)::Traversal::doIt(swift::Expr*) + 160
12 swift-frontend           0x0000000101fc99c4 swift::ASTVisitor<(anonymous namespace)::Traversal, swift::Expr*, swift::Stmt*, bool, swift::Pattern*, bool, void>::visit(swift::Expr*) + 144
13 swift-frontend           0x0000000101fc9088 (anonymous namespace)::Traversal::doIt(swift::Expr*) + 124
14 swift-frontend           0x0000000101fc9000 swift::Expr::walk(swift::ASTWalker&) + 32

[zoecarver]

Work around:

value.count(CInt(2))

[zoecarver]

The fix for this issue is: "dependent return types don't work, we should just disable them."