[win][compiler-rt] Make tests use lld-link instead of link

[aeubanks]

Summary

Git bash ships with a link.exe. We try to add git bash to the beginning
of PATH (see D84380). These tests end up executing the wrong link.exe.

As a workaround, use lld-link. Note that REQUIRES: lld-available tests currently aren't running, see D128567. I did manually verify that these tests pass with lld-link.

[rnk]

lgtm

compiler-rt/test/asan/TestCases/Windows/dll_and_lib.cpp

 // Just make sure we can link an implib into another DLL
 // This used to fail between r212699 and r212814.
 // RUN: %clang_cl_asan -DCONFIG=1 %s -c -Fo%t.1.obj
-// RUN: link /nologo /DLL /OUT:%t.1.dll %t.1.obj %asan_dll_thunk
+// RUN: lld-link /nologo /DLL /OUT:%t.1.dll %t.1.obj %asan_dll_thunk
 // RUN: %clang_cl_asan -DCONFIG=2 %s -c -Fo%t.2.obj
-// RUN: link /nologo /DLL /OUT:%t.2.dll %t.2.obj %t.1.lib %asan_dll_thunk
+// RUN: lld-link /nologo /DLL /OUT:%t.2.dll %t.2.obj %t.1.lib %asan_dll_thunk
 // REQUIRES: asan-static-runtime
+// REQUIRES: lld-available
 
 #if CONFIG==1
 extern "C" __declspec(dllexport) int f1() {
   int x = 0;
   return 1;
 }
 #else
 extern "C" __declspec(dllexport) int f2() {
   int x = 0;
   return 2;
 }
 #endif

compiler-rt/test/asan/TestCases/Windows/dll_large_function.cpp

 // Make sure we can link a DLL with large functions which would mean
 // functions such as __asan_loadN and __asan_storeN will be called
 // from the DLL.  We simulate the large function with
 // -mllvm -asan-instrumentation-with-call-threshold=0.
 // RUN: %clang_cl_asan %s -c -Fo%t.obj -mllvm -asan-instrumentation-with-call-threshold=0
-// RUN: link /nologo /DLL /OUT:%t.dll %t.obj %asan_dll_thunk
+// RUN: lld-link /nologo /DLL /OUT:%t.dll %t.obj %asan_dll_thunk
 // REQUIRES: asan-static-runtime
+// REQUIRES: lld-available
 
 void f(long* foo, long* bar) {
   // One load and one store
   *foo = *bar;
 }

compiler-rt/test/asan/TestCases/Windows/unsymbolized.cpp

 // When we link a binary without the -debug flag, ASan should print out VAs
 // instead of RVAs. The frames for main and do_uaf should be above 0x400000,
 // which is the default image base of an executable.
 
 // RUN: rm -f %t.pdb
 // RUN: %clangxx_asan -c -O2 %s -o %t.obj
-// RUN: link /nologo /OUT:%t.exe %t.obj %asan_lib %asan_cxx_lib
+// RUN: lld-link /nologo /OUT:%t.exe %t.obj %asan_lib %asan_cxx_lib
 // RUN: not %run %t.exe 2>&1 | FileCheck %s
+// REQUIRES: lld-available
 
 #include <stdlib.h>
 #include <stdio.h>
 int __attribute__((noinline)) do_uaf(void);
 int main() {
   int r = do_uaf();
   printf("r: %d\n", r);
   return r;