Fix clang driver tests for cspgo in lld

The tests introduced by https://reviews.llvm.org/D151589 were failing
because I guess some test platforms don't have `lld`. Similar tests add
`-B%S/Inputs/lld` to the clang commands so lets try this here to fix the
tests.

```
clang: error: invalid linker name in argument '-fuse-ld=lld'
```

Author: ellishg

clang/test/Driver/cspgo-lto.c

@@ -5,14 +5,14 @@
 
 // CHECK: -plugin-opt=cs-profile-path=default.profdata
 
-// RUN: %clang --target=apple-arm64-ios -### %t.o -flto=thin -fuse-ld=lld -fprofile-use 2>&1 | FileCheck %s --check-prefix=DARWIN-USE1
-// RUN: %clang --target=apple-arm64-ios -### %t.o -flto=thin -fuse-ld=lld -fprofile-use=a.profdata 2>&1 | FileCheck %s --check-prefix=DARWIN-USE2
+// RUN: %clang --target=apple-arm64-ios -### %t.o -flto=thin -fuse-ld=lld -B%S/Inputs/lld -fprofile-use 2>&1 | FileCheck %s --check-prefix=DARWIN-USE1
+// RUN: %clang --target=apple-arm64-ios -### %t.o -flto=thin -fuse-ld=lld -B%S/Inputs/lld -fprofile-use=a.profdata 2>&1 | FileCheck %s --check-prefix=DARWIN-USE2
 
 // DARWIN-USE1: "--cs-profile-path=default.profdata"
 // DARWIN-USE2: "--cs-profile-path=a.profdata"
 
-// RUN: %clang --target=apple-arm64-ios -### %t.o -flto=thin -fuse-ld=lld -fcs-profile-generate 2>&1 | FileCheck %s --check-prefix=DARWIN-GEN1
-// RUN: %clang --target=apple-arm64-ios -### %t.o -flto=thin -fuse-ld=lld -fcs-profile-generate=directory 2>&1 | FileCheck %s --check-prefix=DARWIN-GEN2
+// RUN: %clang --target=apple-arm64-ios -### %t.o -flto=thin -fuse-ld=lld -B%S/Inputs/lld -fcs-profile-generate 2>&1 | FileCheck %s --check-prefix=DARWIN-GEN1
+// RUN: %clang --target=apple-arm64-ios -### %t.o -flto=thin -fuse-ld=lld -B%S/Inputs/lld -fcs-profile-generate=directory 2>&1 | FileCheck %s --check-prefix=DARWIN-GEN2
 
 // DARWIN-GEN1: "--cs-profile-generate"
 // DARWIN-GEN1-SAME: "--cs-profile-path=default_%m.profraw"