Use xcselect only for -macosx triples

Using them for `-darwin*` triples makes many tests fail.

Author: carlocab

clang/lib/Driver/ToolChains/Darwin.cpp

@@ -2271,7 +2271,9 @@ void Darwin::AddDeploymentTarget(DerivedArgList &Args) const {
     }
   }
 #ifdef CLANG_USE_XCSELECT
-  else if (getTriple().isMacOSX()) {
+  // FIXME: This should check for `getTriple().isMacOSX()`, but this breaks
+  // many tests. See https://github.com/llvm/llvm-project/pull/119670.
+  else if (getTriple().getOS() == llvm::Triple::MacOSX) {
     char *p;
     if (!::xcselect_host_sdk_path(CLANG_XCSELECT_HOST_SDK_POLICY, &p)) {
       Args.append(Args.MakeSeparateArg(

clang/test/Driver/arc.c

@@ -1,6 +1,3 @@
-// XFAIL: xcselect
-// FIXME: There's no reason why this should fail with CLANG_USE_XCSELECT.
-
 // RUN: not %clang -ObjC -target i386-apple-darwin10 -stdlib=libstdc++ -m32 -fobjc-arc %s -fsyntax-only 2>&1 | FileCheck %s
 // RUN: not %clang -x objective-c -target i386-apple-darwin10 -stdlib=libstdc++ -m32 -fobjc-arc %s -fsyntax-only 2>&1 | FileCheck %s
 // RUN: not %clang -x objective-c++ -target i386-apple-darwin10 -stdlib=libstdc++ -m32 -fobjc-arc %s -fsyntax-only 2>&1 | FileCheck %s

clang/test/Driver/clang-g-opts.c

@@ -1,6 +1,3 @@
-// XFAIL: xcselect
-// FIXME: There's no reason why this should fail with CLANG_USE_XCSELECT.
-
 // RUN: %clang -### -S %s        2>&1 | FileCheck --check-prefix=CHECK-WITHOUT-G %s
 // RUN: %clang -### -S %s -g -target x86_64-linux-gnu 2>&1 \
 // RUN:             | FileCheck --check-prefix=CHECK-WITH-G %s

clang/test/Driver/clang-translation.c

@@ -1,6 +1,3 @@
-// XFAIL: xcselect
-// FIXME: There's no reason why this should fail with CLANG_USE_XCSELECT.
-
 // RUN: %clang -target i386-unknown-unknown -### -S -O0 -Os %s -o %t.s -fverbose-asm -fvisibility=hidden 2>&1 | FileCheck -check-prefix=I386 %s
 // I386: "-triple" "i386-unknown-unknown"
 // I386: "-S"

clang/test/Driver/darwin-builtin-modules.c

@@ -1,6 +1,3 @@
-// XFAIL: xcselect
-// FIXME: There's no reason why this should fail with CLANG_USE_XCSELECT.
-
 // Check that darwin passes -fbuiltin-headers-in-system-modules
 // when expected.
 

clang/test/Driver/darwin-debug-flags.c

@@ -1,6 +1,3 @@
-// XFAIL: xcselect
-// FIXME: There's no reason why this should fail with CLANG_USE_XCSELECT.
-
 // RUN: env RC_DEBUG_OPTIONS=1 %clang -target i386-apple-darwin11 -I "path with \spaces" -g -Os %s  -emit-llvm -S -o - | FileCheck %s
 // RUN: touch %t.s
 // RUN: env RC_DEBUG_OPTIONS=1 %clang -### -target i386-apple-darwin11 -c -g %t.s 2>&1 | FileCheck -check-prefix=S %s

clang/test/Driver/darwin-header-search-system.cpp

@@ -1,6 +1,4 @@
 // UNSUPPORTED: system-windows
-// XFAIL: xcselect
-// FIXME: There's no reason why this should fail with CLANG_USE_XCSELECT.
 
 // General tests that the system header search paths detected by the driver
 // and passed to CC1 are correct on Darwin platforms.

clang/test/Driver/darwin-ld-platform-version-macos.c

@@ -1,5 +1,6 @@
 // XFAIL: xcselect
 // FIXME: There's no reason why this should fail with CLANG_USE_XCSELECT.
+// See https://github.com/llvm/llvm-project/pull/119670.
 
 // RUN: touch %t.o
 

clang/test/Driver/darwin-ld.c

@@ -1,6 +1,3 @@
-// XFAIL: xcselect
-// FIXME: There's no reason why this should fail with CLANG_USE_XCSELECT.
-
 // Check that ld gets arch_multiple.
 
 // RUN: %clang -target i386-apple-darwin9 -arch i386 -arch x86_64 %s -### -o foo 2> %t.log

clang/test/Driver/darwin-multiarch-arm.c

@@ -1,6 +1,3 @@
-// XFAIL: xcselect
-// FIXME: There's no reason why this should fail with CLANG_USE_XCSELECT.
-
 // Check that we compile correctly with multiple ARM -arch options.
 //
 // RUN: %clang -target arm7-apple-darwin10 -### \