[E0034] found more than one items for method

[MahadMuhammad]

Multiple Applicable items found for method foo - E0034

Added rich location and error code for E0034

Also, Fixes #2366

Code tested:

• gcc/testsuite/rust/compile/generics6.rs

/home/mahad/Desktop/mahad/gccrs/gcc/testsuite/rust/compile/generics6.rs:29:23: error: multiple applicable items in scope for: ‘test’ [E0034]
    9 |     fn test() -> i32 { // { dg-error "possible candidate" "TODO" { xfail *-*-* } }
      |     ~~                 
......
   19 |     fn test() -> i32 { // { dg-error "possible candidate" "TODO" { xfail *-*-* } }
      |     ~~                 
......
   29 |     let a: i32 = Foo::test(); // { dg-error "multiple applicable items in scope for: test" }
      |                       ^~~~
      |                       multiple test found
/home/mahad/Desktop/mahad/gccrs/gcc/testsuite/rust/compile/generics6.rs:29:18: error: Failed to resolve expression of function call
   29 |     let a: i32 = Foo::test(); // { dg-error "multiple applicable items in scope for: test" }
      |                  ^~~

---

gcc/rust/ChangeLog:

* typecheck/rust-hir-type-check-expr.cc (TypeCheckExpr::visit): Added rich location and error code.

gcc/testsuite/ChangeLog:

* rust/compile/generics7.rs: Updated dejagnu comment.
* rust/compile/issue-925.rs: likewise.

[philberty]

LGTM