[lldb][test] TestExprLanguageNote.test: require LLD on Windows

Otherwise debug-info is stripped, which influences the language of the
current frame.

Also, set explicit breakpoint because Windows seems to not obey the
debugtrap.

Log from failing test on Windows:
```
(lldb) command source -s 0 'lit-lldb-init-quiet'
Executing commands in 'D:\test\lit-lldb-init-quiet'.
(lldb) command source -C --silent-run true lit-lldb-init
(lldb) target create "main.out"
Current executable set to 'D:\test\main.out' (x86_64).
(lldb) settings set interpreter.stop-command-source-on-error false
(lldb) command source -s 0 'with-target.input'
Executing commands in 'D:\test\with-target.input'.
(lldb) expr blah
            ^
            error: use of undeclared identifier 'blah'
note: Falling back to default language. Ran expression as 'Objective C++'.
(lldb) run
Process 29404 launched: 'D:\test\main.out' (x86_64)
Process 29404 stopped
* thread #1, stop reason = Exception 0x80000003 encountered at address 0x7ff7b3df7189
    frame #0: 0x00007ff7b3df718a main.out
->  0x7ff7b3df718a: xorl   %eax, %eax
    0x7ff7b3df718c: popq   %rcx
    0x7ff7b3df718d: retq
    0x7ff7b3df718e: int3
(lldb) expr blah
            ^
            error: use of undeclared identifier 'blah'
note: Falling back to default language. Ran expression as 'Objective C++'.
(lldb) expr -l objc -- blah
                       ^
                       error: use of undeclared identifier 'blah'
note: Expression evaluation in pure Objective-C not supported. Ran expression as 'Objective C++'.
(lldb) expr -l c -- blah
                    ^
                    error: use of undeclared identifier 'blah'
note: Expression evaluation in pure C not supported. Ran expression as 'ISO C++'.
```

Author: Michael137

lldb/test/Shell/Expr/TestExprLanguageNote.test

@@ -1,3 +1,5 @@
+# REQUIRES: (system-windows && lld) || !system-windows
+
 # RUN: split-file %s %t
 # RUN: %clang_host -g %t/main.cpp -o %t.out
 #
@@ -11,7 +13,7 @@
 
 int main() {
   int x = 10;
-  __builtin_debugtrap();
+  return x;
 }
 
 #--- with-target.input
@@ -21,6 +23,7 @@ expr blah
 # CHECK-TARGET: (lldb) expr
 # CHECK-TARGET: note: Falling back to default language. Ran expression as 'Objective C++'.
 
+b 4
 run
 
 expr blah