[LTO] Fix tests with ld64 from Xcode 16 (#97193)

ld64 tests now fail with the following error if the target platform
(e.g. `-macosx_version_min`) is not specified:

```
warning: platform not specified
warning: No platform min-version specified on command line
kernelKit can only be used with -r, -kext and -static
```

Author: BertalanD

llvm/test/tools/lto/no-bitcode.s

@@ -2,4 +2,4 @@
 ; libLTO.dylib shouldn't assert on invalid inputs.
 ; RUN: llvm-mc -triple=arm64-apple-ios7.0.0 -filetype=obj -o %t.o
 ; RUN: llvm-ar r %t.a %t.o
-; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -O0 -o %t.dylib %t.a -lSystem
+; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -macosx_version_min 10.14.0 -dylib -mllvm -O0 -o %t.dylib %t.a -lSystem

llvm/test/tools/lto/opt-level.ll

@@ -1,7 +1,7 @@
 ; RUN: llvm-as %s -o %t.o
-; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -O0 -o %t.dylib %t.o -lSystem
+; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -macosx_version_min 10.8.0 -dylib -mllvm -O0 -o %t.dylib %t.o -lSystem
 ; RUN: llvm-nm --no-llvm-bc %t.dylib | FileCheck --check-prefix=CHECK-O0 %s
-; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -O2 -o %t.dylib %t.o -lSystem
+; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -macosx_version_min 10.8.0 -dylib -mllvm -O2 -o %t.dylib %t.o -lSystem
 ; RUN: llvm-nm --no-llvm-bc %t.dylib | FileCheck --check-prefix=CHECK-O2 %s
 
 target triple = "x86_64-apple-macosx10.8.0"

llvm/test/tools/lto/print-stats.ll

@@ -1,6 +1,6 @@
 ; RUN: llvm-as %s -o %t.o
-; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -stats -o %t.dylib %t.o -lSystem 2>&1 | FileCheck --check-prefix=STATS %s
-; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -o %t.dylib %t.o -lSystem 2>&1 | FileCheck --check-prefix=NO_STATS %s
+; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -macosx_version_min 10.8.0 -dylib -mllvm -stats -o %t.dylib %t.o -lSystem 2>&1 | FileCheck --check-prefix=STATS %s
+; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -macosx_version_min 10.8.0 -dylib -o %t.dylib %t.o -lSystem 2>&1 | FileCheck --allow-empty --check-prefix=NO_STATS %s
 ; REQUIRES: asserts
 
 target triple = "x86_64-apple-macosx10.8.0"